Thorin makes no move to return the greeting, he just chews his pipe for a moment before blowing a smoke ring above his head. He looks the Elf up and down a moment, feeling as though he should recognize him.

"You are not the only Elf in this castle," Thorin pointed out. "I merely wonder why the blasted place feels the need to bring more Elves instead of more of my kind."

He is indeed lonesome for his Company - and is jealous that the castle has elected to bring another Elf.