1.) One word explanation, you suffered from the hands of = ROID RAGE
2.) Sometimes I noticed that novice or beginners will think they are going 20%, but in fear they will spar 100% because they cant control themselves. Other guy probably got clipped by you hard but you did not notice it. He probably got mad or frustrated.
3.) Don't spar, unless you can control yourself, both technically and emotionally.
4.) Sparring sessions are not proving grounds or real fights, no such thing as winning a spar. I find it funny when noobies brag about winning a sparring session. Sparring should be for technical, timing, and movement, not power. Power is for the pads and the bags. Keep the real fighting for real fights. Noobies will brag about their sparring records, LOL! 100-0 in sparring but 0 record in real fights.