guess it's magic that redirects any kind of misfortune from yourself to a target?
using dolls as substitute to take sickness/malice from someone is common shaman things, guess she just modify it a bit so she can designate a person as the "doll".
If villains are fighting with each other without endangering the surroundings, let them. If you absolutely must interfere, then it's okay to ask them to pause for a little while so that you can fetch your popcorn.
The ninjas don't actually know any magic so I'm rather interested as to what she's tricking Misaka with.
If they did have magic then a lv 5 would be considered too easy.