ah, that sucks.
Comm 4 is pretty cool, there's a very fast way to beat it though...head straight towards the moon until you see the satellite, destroy it, head away from the moon, the shield to comm 4 should be down, and you can destroy it. Pretty cheap trick, but it won't earn you a gold medal.
Battle is a pure form of expression. It is heart and discipline, reduced to movement and motion. In battle, the words are swept away, giving way to actions-- mercy, sacrifice, anger, fear. These are pure moments of expression.