You know what the dealer screwed up . . . he should have announced the raise.

But you know who also screwed up . . . P2

you do not show down your cards by throwing them forward. Players have an obligation to protect their hand. You do not relinquish possession of your hand until the pot has been awarded to you.

Now I agree that if P1s hand is retreivable here the best ruling for the floor to make would be retrieve the cards and give p2 the option to act on the raise, I just disagree that that p2 is an innocent victim here.