Re: The Orange Cat(need some advice asap)
Hi, welcome and I'm sorry this sad event is cause for your first post.
I suppose if you had to, you could shoot him, though when done right it is quick for the cat but can be traumatic for the shooter.
You may be able to get a Humane Society associate out there to trap him, but his condition sounds very dire, a I would recommend you trap him or put him in a cat carrier as soon as you can and take him to the Humane Society, because it doesn't sound like he can wait, this needs to be done right away.
Most places, I imagine would euth with the injection into a vein/artery, but if he is un-handleable, they may give him a shot or tablet that would imobilize him first and then administer the euth shot. Either way, staff will be present, holding him and talking to him as he goes. They may be quick and efficient, but they are compassionate, too.
Another thing, don't YOU feel bad about doing this. What you are doing (helping him over The Bridge) is a wonderful gift you are giving him, because you care.
We took in a tomcat who was a feral wanderer for at least 9yrs before he showed up in our barn. He lived with us, as a retired housecat, for at least 4 years before we had to euth/bury him. Some feral/homeless cats get very lucky by finding people like us. The Orange kitty is lucky to have found you, who is willing to help him along.
I'll be thinking of you and the orange cat,