Whoa. What a scare. Surprising how rough their fights can be.
Ok let me say something here.
Don’t feel like no one here cares. We do. We really do. Don’t feel shy or rejected b4 we get an answer or comment to your post. We are all in different time zones and come on at different times. Some of us are online here more than others depending on work and other things we need to do.
If you don’t get a response right away don’t worry about it or take it personally. This site has a very good caring group of people here. Not like some groups or blogs I have come across. Some groups are really nasty. 
also sometimes we just don’t know what to say lol
About bonding if they are neutered/spayed bonding can start. There is a bonding section here to direct your concerns. Of course the sick fellow needs to get well first. He probably received quite a shock just like you did. Buns never stop surprising us.