Well, we aren't sure if the poison damage happens first or if it happens at the same time as the first attack. Kills says the latter, which is why he and GG are testing the antimatter situation. But if they do happen at the same time, in the first situation I mentioned, Player 2's health would go to 0 due to poison, and Player 1's health would go to 0 due to the gravity pulled doll + giant frog, and they would happen at the same time.