Your Move, Red

forgot to mention, no heavy blows(pun not intended if there is a pun)

Current HP:

Heavy: 100/100 HP
Super Pretztail: 25/100 HP

If Heavy knocks Super Pretztail's HP to 0, he will leave Heavy alone, not die, so Heavy can poison Patrick.
If Super Pretztail knocks Heavy's HP to 0, he will be sent to their "prison" that is probably much lower security than the Wheatley Supermax Penitentiary