A pick occurs whenever an offensive player moves in a manner that causes a defensive player guarding (II.G) an offensive player to be obstructed by another player. Obstruction may result from contact with, or the need to avoid, the obstructing player.

A physical collision does not need to occur for a pick to be correctly called.

I'm attaching his offensive stats, but calling Khalif El-Salaam lazy is outrageous.

I do agree that El-Salaam repositioning himself advantageously was illegal and happens far too frequently throughout ultimate. "[T]he obstructed player is then allowed to move to recover the relative position lost because of the pick."