Bare in mind the witch can only target one person at once, but she can knock the players back when she's charging. She'd still insta kill all the enemies except The Tank on expert, but Tank's are her biggest threat. She'd just stand around sobbing a little and rubbing her eyes or nose. She'd basicaly walk when you aren't going to fast, and run to keep up with you. She'd make the same noises as usual when attacking infected. You can heal her just like the other players.