"Wait, what the what?"
Perhaps at some point you've seen a cat make a weird face while smelling something. The weird face is the flehmen response. What the cat is actually doing is drawing air up to the vomeronasal organ, located near the roof of the mouth, to get more information about what it is they're smelling.
In mammals the flehmen response is typically pulling up pheromone information from another mammal of the same species, and is related to reproductive activity.
Because the Daraz Harcos are non-reproducing members of their species, they care not about reproductive activity. Instead, given that they are the primary hunters and defenders for the Daraz, their flehmen response is used to gather information about other species: "Is this something I want to eat, or to prevent from getting into the hive? Or both?"