Thank you! This is something I've thought about a lot actually. I ended choosing not to do it since I wanted the BE to feel more permanent, and with the limited space and amount of stuff happening during fights it would have been hard to notice anyway...
There's a bit more to it, but that's the gist of it!
It's a surprisingly complicated issue. I might actually make some special fights where the rules are a bit different and BE does happen mid fight, but other than that I do have a few plan on how to add more BE content, it's just going to take a bit of time to implement ^^