You try to use your fingers to cast doubt on people by using them to imitate each other. Right now you're using your fingers as finger puppets, imitating one of your friends to the others.
Everyone thinks the friend you were trying to imitate is the imitation now and they have them in a guillotine (ぎ). You even doubt if they're an imitation or if your fingers are the imitation.
Currently there are no similar looking kanji which exist in the WaniKani learning system