Well....if you want handy tips for fighting one on one:
Keep your guard up, but not like in boxing. A bit lower, somehwere on the level just beneath your chin
If you want to hurt him badly, wait until he makes a swing at you, let's say to the left side of your face. Stop the blow or parry it with your corresponding arm (i.e. he attacks with his left, you stop it with your left. Very tricky to do it) but also catch his fist and don't let go. That will leave an opening for his left side. Mark a kick onto that place with your knee (or not), the guy should instictively try to parry the kick with his other hand and will probably lean a bit to soften the blow. This gives you a perfect chance to land him an elbow hit on the face (the whole thing is tricky and has to be done fast or else it won't work, he'll figure out what you're doing).
An easier way? If you see that he isn't protecting his legs or knees, use a round kick on one of his knees, usually just below the joint. This shloud make him lose feeling in his leg and make him kneel. Perfect chance to whack him good on the head with either a kick or hit.
That's all for now.
Deep into the darkness pearing
Long i stood there
Wondering
Fearing
Doubting.
