You don't answer, and it might be because you are genuinely wondering if you [i]are[/i] out of your mind. You cough and spit a mouthful of gravel onto the ground. This troll's stare is making you [i]extremely[/i] nervous, but you don't show it because you can't. If you do, he will perceive your weakness and take advantage of it. So, before he has the opportunity to notice your shifty expression, you retort, "I asked first, dipstick," and brush the pieces of rock out of your hair with a disdainful grimace. 

Naturally, your eyes travel down to the pickaxe and your stomach turns. Even though the stranger isn't exactly holding the tool, he may as well be armed. You have to do something. 

Forget trying to find out what in the heck this troll is doing: you lunge for the pickaxe.