Angle is a very important part when battling and if used right it can give you the upper hand over your opponent. It's very important to understand the angles in a battle. This is mainly used with ninja tools (shuriken, kunai and other projectiles) but you can also use this with certain techniques that are launched at your opponent. Just by stating the angle you can confuse your opponent.
For example:Ninja 1 and Ninja 2 are fighting. N1 throws 2 kunai at N2, one at the angle of 25 and the other on 75. The lower the angle,the faster the projectile. Most new people would say:"I intercept the kunai with one of my own, blocking them both." If you use angles, this is where you can score.
Here is a pic for reference:
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If N1 threw the kunai at an angle of 25 first your opponent would probably be defending from that one first thus he would fail to notice the other one. If he blocks the first one then the second one would hit him unless he kept his focus. Thus with one blow you can cause fatal injuries.
Understand? If not tell me and I will elaborate ^^