Wondering if I can get some clarification on the ruling of stormbringer since ive been playing a bit of voli. Scenario: I have a Gentle Gemdragon in base; opp has a Vex Apathetic and a Mutated Mouser in BF and a Hidden Card. I use stormbringer and target that bf. Does he have to use his hidden before the damage resolves or can he upon cleanup after damage occurs react with the hidden which was a Teemo and he maintains control of the bf?