Holy hell, that's like note-for-note. Want another weird one?
Halo 4's Mantis is ripping off Metroid Prime Hunters' opening cinematic track, which in turn is ripping off the Halo 2 grav lift sound effect.
Maybe both being 1st party Microsoft titles they didn't mind them doing the riff as a shout-out (Glacius is an alien, after all).
Oh boy.
My sound design professor composed the Hunters soundtrack. I'm sure he'd love to hear this... accusation.