When I played with a team of Colossus, IM40 and someone else (can’t remember), the third member of my team was downed, IM was self-stunned after using yellow spell but I could still click fastball special.
It showed me some kind of error with developer strings mentioned, but I don’t know how to take screenshot.
So basically when I try to fastball special with IM40 who self-stunned in the same turn, I got a weird error.