Forgetting to take a Prize and Twins

[Box of Fail]

If player 1 knocks out one of player 2's Pokémon and forgets to take a prize card, then player 2 activates Twins when the number of prize cards they have is still the same (but player 1 should have fewer), is player 2 in violation of the rules, beyond his failure to remain aware of the game state? e.g. if both players notice this a few turns later, would it constitute a broken game state on player 2's part?

Thanks!

 

[PokePop]

No. This is Player 1 being in violation of the game state.

The very one, most important ever, thing that absolutely, positively MUST be correct about the game state is how many prizes are remaining.

You don't get to "forget" to draw a prize.
Even if the fact that a prize was not drawn is discovered many, many turns later, that part of the game state MUST be corrected. If the hand has been cycled during that time, as it quite likely, then it may be that the prize is just shown to Player 1 and shuffled into the deck.
But it MUST be drawn to correct the game state.