Firo can't hold back something of a smile himself; at least this guy seems somewhat normal and pleasant, which is more than he'd dare to hope for. He supposes a little craziness is the price for that.

He walks forward, eyes following wherever the man points. "Just to warn you, I haven't done this kinda thing since I was a kid, so... I can't make any promises for quality."

Despite the chill, he rolls up his sleeves, ready to start working.