Alexstrasza set Dick and Heimdall, who had been sitting on her back, down on the ground, then beat her wings and charged back toward the blazing battlefield.
Heimdall kept glancing back at the battlefield behind them. Most of the army was still fighting fiercely there. Only he, Dick, Eir and her Val'kyr Guard, and Malygos, the Aspect of the Blue who specialized in magic, had broken away from the main force and pushed into the deeper passages.
That did not mean they were the only ones attacking Ulduar's interior. The other high-level combatants needed to stabilize the situation in the Training Grounds before entering to join them. Dick and Heimdall were merely scouting ahead.
In fact, although Mekkatorque and Garrivitz looked as though they intended to face the Flame Leviathan alone, no one would leave those two little fellows, neither of whom excelled on a battlefield, to fight unsupported. The Storm Beacons were nowhere near destroyed, so even after defeating the Flame Leviathan, Dick's army would establish a defensive line in the Training Grounds to stop the Iron Burning Legion's continued advance, buying time for Dick and the other high-level combatants who had entered Ulduar to fight the decisive battle.
They only needed to delay the enemy, not defeat them. The disparity in numbers was too great. Once the siege engines ran out of ammunition, a bitter struggle would be inevitable. That meant Dick and the other vanguards had to resolve everything in the shortest possible time.
Ulduar, however, was simply too vast. Until they activated the teleportation device in the Front Hall, they could only travel between its various areas using Portals that Malygos personally set up.
Only after entering this city did they discover that it was far larger than it appeared from outside. It was practically another