If you are not part of the battle if a fight is going, you can enter and watch yes, but only about 1 or 2 post per page. It disrupts the flow of battle when people just randomly jump in to it, talking nonsense.
Example:
ninja 1: I throw a kunai at steve.
ninja 2: I catch the kunai and toss it back with more force.
poser:I stand in a tree and watch the fight.
ninja 1: I dodge the kunai and rush toward you, readying a spining kick.
poser:"go!! you can do it!"
ninja 2: I take the kick and fly to a tree.
poser: Damn!! got you good.
See the point?? Randomly coming in and posting away like its the mess hall is the wrong idea. so keep it to 1,2 post per page. And make sure you make sense when you do so. Don't do something like lets say the fight is in a deserted area, but you come in on a tree. hell no. If I see such stupid mistakes I'll freeze the tree with you still on it, and that goes for any other prop.
and post that you are watching the fight, not some random crap like "I practice my fire ball jutsu" because it makes no sense. and doing this is Epic battles could get you killed, if your in the way. so you might want to save that second post to say you get the heck out the way.
That is all.