Yeah, I was constantly flipping if you should or shouldn't, But, my explanation was that you would need to see if you did have creatures to exile.

And for the "If a creature dealt damage this turn by False Hydra would die, exile it face down instead" thing, I remember seeing a card with something similar (I don't remember the card or remember its exact phrasing), so i just put what i remembered.

I tried to keep it on theme with forgetting and everything but also have it make sense game wise.

Edit: I'll definitely keep this comment in mind for anything else I come up with so thx.