Feral or unferal, your kitty may get tangled up in one of these if they are in particular an outdoor cat.
Indoor cats if by themselves are obviously not as prone to this risk, unless they find themselves outside, or a stray visitor inside.. but two or more indoor cats can have their "bad" days as well.
If you allow your cat to roam outside in the big wild outdoors, I seriously recommend you take kitty to your veternarian from a young age and start getting him vaccinated!
And make sure this is done every year no questions!
This is necessary if you don't want your kitty to get infected by nasties like Feline Aids (FIV) which is transmitted through blood while fighting.
(FLV). It is also highly advisable to get him (or her) neutered.
Unspayed males will fight feirsly for a female if she is in heat, which can leave both cats in tatters and spayed males can find themselves in the middle of something they don't understand if an unspayed males get the wrong idea...
For indoor cats, obviously water all over the carpet is unwanted so I find usually placing a large object between the two which will cut of eye contact with both cats, if they are engaged in a fight, don't get in their way as cat bites can not only hurt, but are more likely to become infected than dog bites.
Use a chair and turn upside down and use the back of the chair and gently slide the chair between the cats, this will startle them and stop them from fighting.