But as Ralph mentioned earlier this requires that we make a judgement call that the player in question INTENTIONALLY has gone OB. IMHO in 99% of the cases that's simply not happening.
We've also discussed how "intentional" doesn't mean what it normally means in this context. Intentional in this case means "as opposed to being forced out." A much better term (actually used in the case book) is VOLUNTARY. By voluntary, it is meant that the player was not forced out, but went out under his own power, either on purpose, or accidentally. In either case, if he influences the play, he is guilty of IP. Take a look at case play 9.6.2 Situation A.
To follow up, if that player had been forced out and touched the pass, it would have only been an incomplete pass.
It's not so much intent, as it is objective fact. The only question to answer is whether A was forced out.