Vasher was staring at Brady and not paying any attention where the reciever was going, and the safety was caught in a bind between picking up the slot reciever and dropping back.
I don't know that a Grossman injury would really hurt the team at this point. Yeah, it would, because right now, despite his stupidity, he's the only reason we've been moving the ball.
Outside of a couple plays (the Dillon run), this game has been all Bears. If the Refs were actually calling a fair game, its a good chance we would be up by a lot right now.