How would I make efficient punching with combo moves if the key is repeatedly tapped?

I actually created a lightsaber that does exactly this. Here's how I went about it. SO what I did is I just created a bunch of debounces, then every time someone would swing, I would set the debounce to true or false. For every debounce that's true/false, I would play a different animation. It would basically be a loop/pattern of debounces, and it works great. I suggest you use at least three debounces, or one debounce for every animation. Sometimes you can add an extra debounce for over heating or cooldown, though I would only use that if you really need it.

Cheers, Zander.