Alex's "parry":
If you press HP+HK, you get a Sledge Hammer. You cannot "parry" on its own.
If an attack touches Alex as you are charging the Sledge Hammer, you get a parry. If you are still holding HP+HK when your parry is finished recovering, you get a Sledge Hammer.
If you release HP+HK before the recovery of the parry finishes, he simply returns to idle.
So to parry multiple attacks, do you need to cancel your first Sledge Hammer, or just hold it down?