I was in a VS match and the opponent had like <20% health left. I activated the BB3 and it ran it's course, but once it ended, the enemy didn't die. Instead, they just staggered; I followed up with Gravity Slingshot to finish the match. I'm wondering if Photo Bop just didn't have enough kick on its own to get rid of all the remaining health, or does it always reserve at least 1 HP (assuming the ability doesn't proc) and leave the victim staggering?