Shutdown
Demolisher gunners can load themselves into the Demolisher's main catapult. The driver can then launch them so that they land on top of Flame Leviathan, near one of the Leviathan Defense Turrets. There are 2 turrets in 10-player mode, 4 in 25-player.
Once the launched player lands atop the Leviathan he will be unable to move and will only be able to melee the turret closest to him. Ranged classes can reach all turrets, so ranged DPS classes are almost always the ones thrown. The turrets will defend themselves with a flame attack, which while not powerful can be problematic. Having a ranged DPS class that can also heal (such as an Elemental Shaman or Moonkin Druid) can help.
The players may eject at any time to be parachuted the ground, although doing so before the Leviathan shuts down is often fatal due to the Leviathan's constant AoE. Players can then jump back into vehicles. Motorcycles, with their sidecars empty, can easily pick up former gunners and ferry them back to their Demolisher seat.
After all turrets are destroyed,and Flame Leviathan goes into an 8 second shutdown,
during which it stops moving or dealing damage, uses no abilities, takes 50% more damage and resets the Gather Speed buff stack.
Shutdown is a highly desirable state, but shooting a Demolisher gunner means he no longer gathers pyrite for that Demolisher. A Demolisher can store enough pyrite for 10 shots. If the driver is conservative and shoots only once every 9 seconds just so the debuff stays up, the stock lasts a minute and more, which is in theory ample time for the gunner to destroy the turrets and resume collecting pyrite. In practise, drivers like to have a twitchy trigger finger, and collecting pyrite requires manoeuvering, so it may in effect take longer and the pyrite stack goes down.