A lot of fighting animations from what I’d say tends to use a fighting style called jeet kune do, it’s sort of a combo of boxing / basic fighting and wing chun, a close quarters martial arts focusing on quick precise powerful strikes to the opponent to quickly knock them down.

If you want an animation that is realistic by how it looks then you need to slow things down, consider how well trained each opponent is and keep the fight either prolonged due to similar skill or fairly quick. A lot of real fights are fast-paced not always very accurate if not at all and quite loose with the movements.

Look at it this way, both sides wants to knock the other out and both don’t want to be attacked or knocked out themselves. For that reason a lot of fights are played defensively trying to get blows in but sort of unsuccessful until some sort of burst of attacks comes in and one or the other person gets knocked out or down.

It’s hard to say but just keep in mind human limitations, skills and the emotions / scenario at hand.