Honestly, Caliborn only wandered over because he saw the axe laying around. While he prefers his gun, he can't see any reason not mess around with someone else's clearly abandoned weapon. That this is a battlefield where they are hopelessly outmatched and in grave danger does not, in fact, occur to him as a reason.

Before he can even lean down to grab the thing up with his free hand, he hears someone moving around in the trees. Reflexively, he abandons the axe in favor of bringing his gaudy gold assault rifle to bear, pointing it upward.

His shoulders slump in what would be relief in most. In this weird little green guy, it's disappointment.

"Oh. It's a normal dude." His expression turns into a grin soon enough, though, and he shouts up. "HEY! TREE-GUY! Are you trying to get their attention?!"