Discovered this when I ran out of ammo and began left-clicking hoping to melee with the pick axe while retreating and that kept appearing in the console. How do you melee biters anyways? I remember a crash fix a while ago when meleeing a biter but I've never managed to figure it out. Plus the pickaxes have damage values on them.
I ended up dying from laughter. No really I had to reload my last autosave because I found this so hilarious and died.
![Very Happy :D](./images/smilies/icon_e_biggrin.gif)