I think the +9 / 1 is the attack from the player on the creature, where a hit causes hypnotism. The attack from creature to creature is the creatures (I would assume), but if a creature has several attack abilities, which one do you pick. I would say, the player picks as they are in control.
What if the one damage kills the creature? Wait... nevermind.
After reading the text, it says simply to choose a creature. Therefore the creature uses the +9 / 1 and avoids my concerns above.
How is that for stream of consciousness?
LOL love your reply and your right on the money! TY