Actually, we were using MMA gloves and shin pads, but it was no “ordinary sparring”, we were beating the crap of each other. We all have been injured(I broke my right hand and my ribs), this is why we quickly changed our approach.
Seriously, you can’t imagine how strong the human body is. Most people assume that they would destroy any kind of opponent with a single punch, but they would quicly realize how wrong they are if they were to fight for real. In the real life a fight between two determined giuys last much longer than in the movies. It is the most important lesson I have learned from doing it: we are not the heroes we think we are.
Trust me, unless you’ve been competing in a striking-based combat sport(muay thai, boxing or kickboxing) for a while, you would feel powerless if you were to punch or kick a guy with full force. A blow that causes a dangerous wound is (most of the time) given by surprise or received by a guy who is not defending himself(fear, intimidation). You don’t know what it takes to be an effective striker. Devastating blows can only be delivered after a long period of practice, and this is not a matter of strength and power, the main components of a successful strike are: timing, distance estimation, and quickness. It comes after a minimal practice.
Of course you can throw one or two effective blows in a fight if you are a beginner, but most of them are likely to miss their target or to be easily predictable. I have seen a shitload of fight between beginners, and most of the time, even if they are strong guys, the blows they receive and give are not causing a lot of harm, usually they end up with a swollen wrist, a blooding nose, but there is little chance to see a major wound.
Once the fight is on the ground, or after the first effective blow, they stop the fight, because it’s only a game. It requires a lot of chance to break a nose, or to ko an opponent on your first attempt in this context if you are not an accomplished fighter.
The human body is much stronger than we are told. If a fight is stopped at the right time, there is little chance to be seriously injured. If you don’t fight all day long, with some precautions(minimal padding), it is not so dangerous.
I’m sure that my statement will quickly be approved by every MMA practionner who is reading it.