Exactly. Get that thing OFF!! If it doesn’t work then they were doomed regardless. However, if it does work then OP is safe. Which, considering that the odds against these things is insurmountable, survival should be the top priority. That and encouraging the broader population to avoid going anywhere near what she did. It’s not safe and only alerts them to a new victim.

Yes, it is I! The voyager!! How dare I not want people do needlessly die for something they cannot stop!! 🙄

This is going to sound extremely fucked up, but he and you need to forget it. You cannot stop them on your own. It is a road that can only lead to one thing. Cut off the scar, and try your best to move on. Never take that substance, distance yourself from it completely. At this time you as well as the OP’s safety should be top priority. Don’t die attempting to be a hero. Some doors are best left unopened.

Cut it off. Call it a self harm scar. Agree to therapy. Gradually get “better”. Then never mention it again. Everyone will just think you had a mental breakdown due to stress. Your life will be different for a little bit, but you’ll be safe.