Sharphorn was standing with his back towards the hill and his front towards the caravan, he was an experienced warrior and therefore never underestimated an opponent, even if that was a hobbit, he thoroughly protected his front with his shield and held his morningstar in a "ready" position just in case.
He was going to introduce himself and ask the hobbits to join the caravan for a while, but then he noticed the humans and dwarves holding the dog leashes..
"Are those your slaves?" Asked Sharphorn as he nodded towards the humans and dwarves.