I got 15 minutes into Legendary, and some Covenant Ultra Elite keeps ganging up on me with another Ultra and a regular Elite in the ship (I forget the name of it...). I have gotten to an upper area where there is a machine gun turret and covenants covering the lower floor, battling my allies. Meanwhile, I head around to the other end of the sector I am within, leaving the turret behind, and I find a Grunt on the stairway. I kill him easily, then I'm followed up by an Ultra Elite. I, fortunately, discovered that strafing while firing with double-weilded SMGs can kill the Ultra without much trouble. So now I have 2 Elites, 1 Ultra, and another Grunt to kill. This is where the ganging occurs. I can't attack the Ultra without jumping to the lower floor, but this would be suicide, as there awaits the other Elites and the Grunt.
I discovered it takes roughly 5-7 Plasma Rifle blasts to eliminate Master Chief. Unholy. Those damn Grunts are, seemingly, the alarms to the Elites that a foe has arrived; if one sees me, the Elites go in for the kill.
The worst part is that hide and recharge my energy, but as I do, the other Elites have their armor recharge as well, so even if I take them one at a time with concentrated fire, I can't kill them.
And also... strafing doesn't work on any of the Elites or the last Ultra after you kill the first Ultra. In other words, they track your strafing and kill you as you do, unlike the first Ultra. Weird...
I can't figure out a formula to eliminate the Ultras and Elites.
Assistance, please...