@OP_senju Numbers and Sozin's Comet. Not a lot the primarily pacifistic air nation could do against the sudden siege of merciless powered up Fire Nation soldiers. Just look at Monk Gyatso's final resting place where he was backed into a corner alone by 8 or so soldiers who he took with him
Now i'm finally posting this stuff
Me and @beanzaru have worked on our own fun TMNT concept and finally got the boys, April and splinter down. I'll ramble some below