If the ball wasn't snapped while he was offside, then he can reset. If he touches an offensive player while offside, then the play is dead.
Which he didn't quite make it all the way back.
I think its there attempt to test the line and also suck the ravens into the mindset that they are gonna try to pound the ball. get the LBs to move up so Peyton will be able to get stuff underneath. oh and then be able to throw in some play action too.
Heh, it's actually quite genius. They are ahead in the first half, and have ran the ball a ton. I predict they run it a lot thier first couple of drives in the second half, and then exploit that secondary that will undoubtedly start to play the run quite liberally.