bard ults can be written in the lore like this: when you got your first little plastic recorder in elementary school, you definitly blew into it as hard as possible as soon as you got your hands on it. Of course this made everyone else really angry and they covered their ears while yelling to never do it again. However, as a musician now wielding your melodies to manipulate dangerous monsters all across Dalaya, you hold the knowledge of that pain and anger caused back then in your back pocket for use in the most dire of circumstances. since bellows are wind mod this makes perfect sense. make it happen.