The forward, Abdul Kader Keïta, was not hit with the ball or slapped across the face or punched, just bumped by the Brazilian star Kaká, who did little more than shrug, sticking his right elbow into Keïta's chest.
That was all it took for Keïta to fall to the turf as if he had been doused with pepper spray.
The referee punished Kaká with a yellow card, his second of the game, forcing his ejection and leaving his team a man down for the rest of the game.
Many who saw the replay wondered whether Keïta's fall was the tournament's latest example of what officials call simulation. Much of the flopping, flailing and falling in soccer is little more than diving to the turf in an effort to dupe the referee.
If successful, the diver could be awarded an unimpeded kick from the point of the infraction or, if it occurs in the penalty area in front of the goal, a penalty kick from 12 yards.
Fans are already seeing as much bad playacting as tricky dribbling during the World Cup in South Africa, despite efforts by FIFA, the sport's world governing body, to punish divers. Some of the best players in the world crumple under imaginary contact to win a penalty, or writhe in seeming pain to run the clock down or give their teammates a breather.
"I wish it wasn't part of the game," said Paul Tamberino, the director of referee development for U.S. Soccer. "Players will do whatever they can."
In his first game of the tournament, the German midfielder Mesut Özil tumbled as if gnomes hiding in the grass at Durban Stadium had tied his shoelaces together during his team's opening game against Australia last week. An innocuous challenge from a defender did not seem enough to send him to the ground. Indeed, no foul was called. Instead, for his ruse, Özil was punished with a yellow card.
Özil's tumble and Keita's pantomime did not affect the outcome of either game; Germany and Brazil easily won their matches. But with so few games, and with goals at a premium at this World Cup (1.97 goals per game through the first 29 games, well below the low-water mark of 2.21 in 1990), an erroneously awarded penalty or unjust suspension could prove decisive.
In the Round of 16 at the World Cup in Germany four years ago, Italy and Australia were tied, 0-0, in added time. Italy's Fabio Grosso rushed into the Australia penalty area and doubled over the lunging defender Lucas Neill. Italy was awarded a penalty kick, converted it for a 1-0 victory and went on to win the title. The penalty kick eliminated Australia.
"When he slid in, maybe I accentuated a little bit," Grosso told Football Plus magazine in the spring. "I felt the contact, so I went down."
According to FIFA's Laws of the Game, "attempts to deceive the referee by feigning injury or pretending to have been fouled" are punishable by a yellow card. But it can be difficult at full speed, with only the naked eye and no video replay to consult, for a referee to spot the difference between a foul and a phantom.
The referee Koman Coulibaly whistled a foul in favor of United States forward Jozy Altidore in the 85th minute of the Americans' 2-2 tie with Slovenia on Friday — awarding a free kick that led to a controversial disallowed goal — but replays showed that minimal contact occurred before Altidore crashed to the ground. Players know they are more likely to get away with it and tacitly condone the practice.
"Personally, I'm against any type of simulation; I don't think it should be part of the game," Alessandro Del Piero, a teammate of Grosso's, said recently, before adding: "It went in Italy's favor and I was happy. If it went against us, I would be upset."
Del Piero and his countrymen were indeed upset in 2002 when Italy was knocked out of the World Cup in South Korea by the host team after Francesco Totti was ejected for a second yellow card after disingenuously trying to earn a free kick.
Referees say that it is difficult to penalize a player for simulation because it is akin to calling him dishonest.
"If you're going to give a caution for simulation and there is contact," Tamberino warned, "it has to be very obvious that he's trying to cheat."
Sometimes, simulation is so transparent that it more resembles vaudeville than world-class soccer.
In 2002, Rivaldo of Brazil was waiting to take a corner kick when Hakan Unsal of Turkey appeared to deliberately kick the ball at him when he was not looking. Rivaldo went down as if he had been shot, clutching his face, right in front of an assistant referee. Unsal was given a red card, signaling an ejection, but Rivaldo was embarrassed when video replay revealed his reaction to be an act. FIFA later fined him $7,350.
"Whether it be the big flop or the big groan, sometimes it's comical," Tamberino said. "You don't like to laugh, but sometimes, you give a smile."
Referees must be close to the play and have the right angle and clear vision to make the correct call. It requires good positioning and communication between the referee and his assistants, one on each sideline. Three years ago, FIFA started a referee assistance program to train officials to, among other things, spot dives. Before the World Cup, FIFA's technical study committee provided referees and assistant referees with scouting reports, including video, that highlighted teams with a reputation for simulation.
Being a good diver may help a player get an occasional call, but when he earns a reputation as a cheat, it can be difficult to erase.
Portugal's Cristiano Ronaldo, one of the fastest and most dangerous forwards, is often the target of deliberate fouls or the victim of overzealous defenders.
"Referees should protect the more skillful players when they are getting fouled by the opposition," he said Tuesday after Portugal's game with Ivory Coast. "Sometimes it is difficult for me when the referees give fouls because they think I dive."
But they think that for good reason. Ronaldo was notorious for feigning when he was a young player. He was lethal on direct kicks, and he relished the chance to show off his ability to strike the ball from long range. But now that he has developed into one of the game's most hardened players, who is often hacked mercilessly by slower, less-skilled defenders, he does not get many calls.
"They don't protect talented footballers anymore," said Carlos Queiroz, the coach of Portugal. "I'd like to see if the rules are the same for everybody."
Players and referees say they know which players go down too easily, but they are reluctant to identify them.
"I'm anticipating all forwards are capable of doing that," said the American defender Oguchi Onyewu, who at 6 feet 4 inches and 210 pounds is an easy mark for conniving forwards who exploit the perception that a bigger player fouls more often.
"I think referees are taking the proper measures now more so than in the past to eliminate that kind of exaggeration," Onyewu said. "Giving the players themselves a card and not the defender."
But defenders and forwards agree that diving will be hard to eradicate as long as players get away with it.
"You try to get the ref on your side and you hope that he can see through all of that," said Jonathan Spector, a defender for the United States. "There's only so much you can control in a game. The call was made. Just get on with it."