I'm pretty sure you m1 then breathe then m1 again, with correct timing because If you are to slow the person will just walk out, and to fast could make it so you dont gain breath, it takes a bit of practice to do.
In my opinion, there should have been a system in the breath of thunder, apart from having the kaigaku clan added to the game, so that anyone who was from the kaigaku clan, and became a hybrid, would have the black thunder breathing
