NCAA: Illegal forward pass and roughing the passer?

[bearclause]

Just a warning that this clip has a way too high sound level:

YouTube - Dumb play

Now it didn't happen that there was roughing, but the defender did place his hands on the QB after he'd caught his own batted back forward pass and threw for a second forward pass. What would have been the consequence if the QB was roughed after throwing an illegal forward pass? I'm thinking NCAA doesn't have a preferential enforcement of the personal foul and they offset. Or is the illegal forward pass first enforced as a live-ball foul and the roughing penalty then enforced as a dead ball foul (automatic first down)?

I suppose the timing would also matter, since the defender had his hands on him for some time and theoretically could have given him a more serious shove well after the receiver was down.