Well, I haven't been on for a while. But I'm re-playing all the games in order, and I was on the way to river-clan, when I accidentally clicked spacebar after the battle with the riverclan warrior, as shown here, and I re-entered battle (Aswell as the warrior still called 'WindClan Warrior', not RiverClan):
I assume that glitch works with either all or most of the warriors, due to the way Admin programmed it and the game works. I haven't tested that though.
If anyone needs a faster way of getting experience, you could try this, maybe.