Just another Enigma.
So everyone was going to investigate the weird noises instead of setting up camp was the Air Bender thought to himself as he saw all of his teammates head like moths towards the proverbial flame. He understood it, it was probably a threat, at the same time the pterodactyl carcass was going to mangy if they spent a couple hours on it. Well he guessed he could make soap out of it later too, maybe whoever they're fighting has cleaning paraphernalia.
So, leaving the pterodactyl corpse behind the air bender would follow after the others through the tree tops until he came onto the clearing, seeing the weirdly armoured men and their weird weapons. He figured they were probably some sort of fast moving projectile, good enough to incapacitate a pretty large creature.
This demanded a certain amount of diplomacy, like the blind girl seemingly wanted to employ- Oh the batwolf fetishist and the weird tiny green spirit stole their weapons. There went that he guessed.
At least he wasn't noticed yet, so from his tree branch he would start the elaborate dance of forming air bubbles around the soldier's head, to reduce their vision.