I’m not sure the exactly reason, but sometimes in a fight the hero box becomes full black. I have the theory that it’s due the fact I don’t wait the animations and they all end up overlapping and instead of blinking, it stay full black. This sometimes only stays like that for a couple seconds, others until I use that hero or make a match of its color. It doesn’t in any way effect the fight nor damage, it’s just a minor animation issue. If I manage to catch one again I will try taking a print screen and attaching to this post.