Wild stray with URI needs help

Why don't you just leave him alone? He obviously doesn't want your
help. Some creatures are just that way. They're solitary and they hate
you no matter what you try to do. You should learn how to take a hint
because he sure is giving them.

Hmm spells like a troll. This cat will probably die if you don't help
him. You're doing the right thing but you do need a trap, yes the trap
will stress him he'll get over it, once you catch him throw a blanket
over the trap it will calm him down. Trap him and get him to a vet he
needs to be treated if he's ill enough to stop eating you'll probably
loose him if you don't get him some help.