Listen, $N.  This is a very delicate situation; even though we've identified the spy, we cannot kill him out in the open.  We cannot try to capture him either as the risk of him escaping is too great.$B$BI want you to go find Prospector Anvilward at the North Sanctum and kill him.  Do this in a quiet manner, we don't want word to spread that we allowed a spy into our city.$B$BBring me his head as proof.  Ironforge will learn not to meddle with the sin'dorei.