ZF Pyramid battle:
A cluster of about 48 mobs (6 lines of 8 across, I think, they start moving very quickly after spawning) form between the bottom of the stairs and the fountain. Most of these will be non-elite while between 3-6 will be elite.
Initially the spawns wander around (seemingly randomly) within the confines of this location.
From 20seconds after the cage is opened on, random mobs from this group will subsequently run up the pyramid in 2's and 4's(these can be either type elite or normal, though I haven't yet seen more then 1 elite go up at the exact same moment this may simply be because of the high ratio of normals to elites) with a gap of between 10-20seconds between each cluster(this also appears to be randomised).
At ~3:00 the waves will drop off and give a period of about 30seconds of non-combat(probably actually a minute total between waves since it will likely take them 30seconds to clean up the mobs already at the top of the stairs) where players can eat and drink. From this point on the waves come in relatively slowly, pretty much no waves faster then 20secs apart and some 30secs apart.
Spawns stop respawning at around 5:00, and any remaining start walking up the stairs at around 6:20. At any point after this if Bly's party of npc's get out of combat, Sergeant Bly says "Let's move forward!" and the group of npcs will proceed towards the bottom of the stairs(they wont actually start moving till they get out of combat) Technically if the party is efficient there will still be mobs coming upstairs when Bly goes downstairs. In reality it is usually around 7-8mins that Bly actually gets free of combat and starts going down.
Bly's party move at 1 speed and depending on combat efficiency, reach the bottom of the stairs anywhere between 7:00 and 10:00 at which point the group face 2 elite bosses (Nekrum Gutchewer and Shadowpriest Sezz'ziz).
Once these two are defeated Sergeant Bly and crew form up in front of the fountain facing the pyramid.
Optional Subquest available from Weegli Blastfuse
"Thanks <playername>. If you hadn't shown up I'm sure we would have been dead meat! Now the only thing between us and the chief troll is that door yonder...
Option: "Will you blow up that door now?"
He places what appears to be an explosive near the door blocking the central pathway which opens the door.
<this is mostly pointless as if you start the fight with Bly, he runs off and the door opens anyway.>
Talk to Bly and sorry didn't have enough time to write down convo before he despawns(~1min) but the basic gist is, you ask for a reward for rescusing him and he does the following:
Sergeant Bly: What? How dare you say that to me?
Sergeant Bly: After all we've been through? Well, I didn't like you anyway!!
Weegli Blastfuse(if he hasn't opened the door for you): I'm out of here (leaves towards instance exit)
Pretty much a straight up fight, he doesn't go red immediately, so it is possible for a party to fall back and prep for the fight. If you dont engage within 1min he despawns using a hearthstone effect.
Mobs:
Waves are made up of:
Sandfury Cretin<elite>
Sandfury Slave
Sandfury Drudge
On engaging Nekrum: 2x Sunfury Zealot(each side) + 1x Sunfury Acolyte(right side, facing away from fountain towards pyramid) spawn in row next to him and another set spawn at 50% health.