I’m no doctor but if he cuts it off it’ll grow back, no?
Lizards are good at that with tails. They can actually shed them and scoot away while the tail twitches to attract the attacker. Some sea life uses similar tactics but adds flashing bioluminescent stuff. They then turn off their lights and move into the darkness.
If he cuts it off it won’t grow back. If he later changes his mind, he’ll need an “Addidictomy.”