That is something that happens on many short yardage plays. When the back is almost stopped, usually a big lineman hits him in the back a pushes him as far as possible. I don't think I have ever seen it penalized and I have been watching football for forty plus years.
LOL...I thought the same thing when Pete Carroll was "sly and clever' enough to "fool" ND with his frantic spike the ball motion with his arm. The stinking clock stopped on the fumble. Who in their right minds would have fallen for the spike ball fake?
I wouldn't even call that a breakdown. Yeah, he's a pretty boy and, sure, he's arrogant...but that SOB Leinart can freaking ball. That was a command performance out there yesterday, especially with the game on the line. That 4th down throw was perfect, and the WR was well covered on the play. Playmakers make plays, and that's what he did.