I’m sure if I saw a kid walking backwards up the wall my very first reaction would be, “Holy cow! I need to videotape that!”
Not, “Oh, sh!t... whatever you do, don’t take your eyes off the crazy possessed kid. What can I get my hands on as a weapon...”
You don’t know that.
Chances are it stunned them. I know it would stun me. Few people have that level of presence of mind.