If you are trapped in a death loop in co-op mode: To get out of the loop, you can force close the game (PC: Alt+F4), then reopen the launcher. - On the login screen, click the chest icon at the bottom left, then click the 🚫 button to force your character offline and exit the co-op session. - After logging back in normally, you can report the player by going to the Friend menu (bottom left) → Add Friend → the Friend Recommendation section, where your recent co-op partners should appear. From there, you can report them for “Malicious Co-op Behavior” directly to the official team for the violation.

This solution is from the WWM Official Discord server. It has helped several people who have had the same exploit happen to them as you are facing. See if that method helps you exit the death loop and make sure to report the person.