I was just happily playing in vanilla2, and I saw a flash of a shaman's wing, it appeared to be on a mouse, is there already a thread about this ? if there is then it's no big deal to report this

what you've seen is a famous glitch that's been reported since the skills event, when a shaman jumps and launches his wings at the correct moment, the wings fuse onto his shoulder as a mouse, some said you could glide but that's a myth and you never could glide, it's a graphical error and it might not be fixed, that's all I know

Yes, the bug is already known and listed here at the Shaman Skill Bug.

Bugs List a dit :

Wings appear on non-shamans: Wings appear on mice who have used them in their shaman round when they aren't shaman. Seems to be a graphic issue; they provide no extra benefit.

Yep I know that glitch, also the mice with wings don't see the wings on their screen so they often get confused when people say "OMG YOU HAVE WINGS!"

That often happens, you appear to have wings sometimes as a mouse. (on other's screen ofc) This bug is pretty famous, so many people are trying to fix it. =)