Entity shoots through mirror!

Kayleigh had brought her bedroom mirror down as she was fed up of seeing shadow figures / creatures / shapes in it at night. The dog started barking, so I came to see what he was barking at, and very quickly saw something black and long shoot out of the mirror and fly across the room! I just cannot tell what it is? It was so quick! Couldn’t find anything. Reminded me of the ‘snake entity’ from a previous video.