Truthfully if Ivory had caught that ball he was about to get destroyed by the big linemen. I think that may have had something to do with it as well. If the ball had been delivered in front of him that linemen probably would have been a non factor but because where it was he was having to pump back a little bit and he was going to get drilled if he caught it.
I'd say 50/50 on the blame for the actual int between ivory and peterman, not every throw is going to be pin-point perfect, you got to protect the ball at least make sure nobody else catches it.