An interruption is essentially any persons right to say 

'wait a second, why would I just stand there while you do-'

So, when formulating any post, keep it simple and succinct. Don't try for too many actions in one post, especially if they're chained together, unless you describe a very specific and careful set of circumstances. It's like covering your back.

Simple do and don't.

Do: Throws a punch -if the punch lands, leaving my opponent unstable- I follow up with a kick.

don't:Throws a punch and then kicks.

Because your opponent may interrupt the punch, which hey-ho you can't do much about if it's plausible, or they might avoid your punch and go for you when you pointlessly kick.

Good way out of this is to have your own post interrupted by their post, but it's nice to include in your original post that your character won't do the exact same thing -unless- circumstances stay the same. Which they hardly never will. 

Good analogy is to imagine playing chess, you could fairly easily win by planning out moves where your opponent doesn't move them-self, but they will move, so accommodate for that. 

Ramble ramble. Keep posts simple... but apparently not in OOC, #hypocrit#needsleep

Oh, and don't talk too much, no-one does that in a fight unless it's a psychological attack, and don't announce your moves -too- obviously, though its to be expected that you have to do something your opponent can pick up on. One good trick is to have something in reserve they can't possibly see, it's how a real fighter would do it. Or feint your attacks, which works better with an actual weapon.