Sucks to see. But this guy is pretty resilient. As I have mentioned, this guy is a two legged nem. When I tried to move it over a year ago, I accidentally tore its body when I thought I was in the clear getting one foot off the rock while not seeing another foot was locked in to another rock. I quickly split it by manually tearing without a knife or scalpel.
When I went to split this guy a couple of weeks ago, we were lucky that cutting the mouth in half did not require cutting through any part of each foot. I think that's why it healed pretty quickly and the foot in your photo showed it so big. I think it will recover over a couple of weeks, as long as the clowns do not jump on it like my boys jumping on a bean bag.
Will check with progress and let me know how I can help.