She got his memories, he's already not useful, but look at him getting a hamburger with the baddie. She's probably gonna use him for a prank on the MC, stabbing him from behind when he inevitably rescues him.
now you built the story like this i can only take a guess that it will drag and the annoying character and that witch will be A HUGE ANNOYING PIECEs OF SHITs to us the readers and the characters by simply existing in the story some will like the witch but man are we fucking hell directly.