Slay them all!

It's just one of those things orcs always say.

Not sure if this is directly related but, when aggroing Drek'Thar in Alterac Valley, he yells:
"Stormpike filth? In my keep! Slay them all!"

Not a specific comment in this thread yet, but noticed that a lot of people are having trouble finding the Wintergrasp quest NPCs, so here we go:

Alright, here's how to find him. If you go at any random time to your landing site or the keep when a battle isn't scheduled any time soon, he'll most likely be there. However, both at the start and end of a battle, I assume as part of the process that resets Wintergrasp, EVERY quest NPC despawns. A few minutes after the start of the battle or the end of it, they'll spawn where they're supposed to be, either at the landing camp or in the fortress.

Edit - Example Process:

Alliance controls WG, 30 minutes until battle
He is spawned at the Flight Point
or
Horde controls WG, 30 minutes until battle
He is spawned in the Fortress

Battle Begins
He is despawned
About 5 minutes into battle
He respawns at wherever he was before the battle started

Battle Ends
He is again despawned
About 5 minutes after battle
He respawns in Fortress if Horde won, at the base camp if Alliance won