Edited by pestilence at 21:40 CDT, 9 April 2010 - 24203 Hits
Fabregas is goal side, the ball is in front of him.
Puyol is behind him and comes in from behind.
Puyol gets his leg between Fabregas and the ball and crucially makes no contact with the ball himself but takes out Fabregas's leg instead.
This is like the definition of a foul tackle.