I'll play nice for a minute; in my life I've knocked people out with one punch. I've also been knocked out. I've had bar fights (just the two). One required me to go get a few stitches/sutures. Such is life.
If anyone came here and kicked off I'd batter the skin off of them (indeed I put a beat down on a burglar back in 2013). But the whole revenge thing is silly. Trust me (a brother of mine did this and he ended up in hospital) . And if you think it was a head fuck before it'll be twice that if you go back on some sort of cycle and you got a 2nd beat down.