You scared him, but you didn’t mean to, and sometimes these things happen. When I found my second rabbit Yohio, he screamed sth so awful when I caught him. We still became best friends =)
Stress-shedding is a reaction to being chased and it’s normal. A predator grabs a rabbit and might only get its mouth full of hair while the bun gets away. The hair grows back. He may look a bit mangy now, but bunnies can shed so they get bald spots, that’s typical of the species.
He’s scared now, but you can regain his trust. You do that by offering nice treats, speaking in a soft voice, not forcing him to come out etc. It can take a while but that’s normal, so be patient.
The most important thing now is to see to that he eats and drinks. Sometimes if a bun gets very scared, it stops eating, and that’s very dangerous. So provide him with nice appetizing food (his favorite vegs f ex) and keep an eye. Clean out his litter-box so you can monitor his pooping and peeing.