Well done.
What I would ask though is was it controlled aggression or was it play acted aggression?
The difference being that (sorry to disagree Jowga) real aggression is emotionally driven.
We're you consciously swinging with limited power or were you consciously controlling the urge to swing?
While both are valuable skills, it's the real aggression that will serve you when your in the corner due to a broken nose and your head is swimming and your afraid for your life. In that situation ones mind and emotions are too damaged to construct something artificial.
Emotions are a driving force in the human mind. If we let them take over our conscious mind we are in trouble but we can harness their pushing power to get is through difficult situations.
It's not for everyone. Mushin (no mind - the classic serene emotionless engine of death in samurai movies) is a valid way to go on the other end of the spectrum, but I think it's an unrealistic ideal for some, at least without very specific training.
I was consciously controlling the urge to hit as hard as I could. And the urge to not break our rules of sparring.
I think aggression is something people are born with. Some can get it through life experiences or learn it, but learning to actually turn it on and use it takes a very long time. I think a few people won't ever truly learn it, but those would have to be very rare; fight or flight is ingrained in our DNA after all.
Very, very few people make it through 10 years of wrestling without aggression. Of the rare exceptions that do, I can't see any of those people having any success. I wasn't the greatest wrestler back in my day, but I was definitely effective. More that anything, wrestling taught me to keep going, no matter how tough it gets. The only successful "passive" wrestlers I've ever seen were so skilled that they easily countered just about anything and always seemed like they were at least 2 moves ahead of their opponent. But that's probably more of a passive aggression - making their opponents feel like they were in control when they really weren't.
I don't view mu shin as some sort of fairytale calm and serene/peaceful state of mind. I view it as "being in the zone." Everything else is blocked out, and you're not consciously "trying" to do anything; you're just doing what comes naturally. You're letting instincts and muscle memory to take over rather than forcing anything. Maybe I'm off or have an inaccurate understanding of it.
Our organization has some prearranged sparring and "self defenses" that we drill quite often. They're not taught as anything that would definitely happen in a real confrontation; they're taught as principals of movement, possible target and corresponding weapon selection, etc. My view of mu shin makes these work for me - when I consciously think about what I'm doing, I mess them up; I get ahead of myself and/or my partner or flat out freeze from overthinking. When I don't think about it, it easily flows the way it should. There's certainly intent and aggression (so long as my partner can handle it) when I'm practicing them. But not thinking about what I'm supposed to do is only possible after I've practiced them to the point where that's possible.
Mu shin to be doesn't mean be nice. It simply means don't consciously think "block now" "hit here" etc.; it means trusting your instincts/muscle memory and letting it take over without thinking about exactly what you should do. Easier said than done
Its hardest for me to do when my partner can't or isn't willing to go at a serious pace/intensity.
Maybe some Asian culture guru will claim I'm totally off with my view of mu shin and say I'm doing some other principle. Makes no difference to me.