Did this on Heroic, with the Famine, Tilt, and Tough Luck skulls on.
Quick steady pace through the level, killed most enemies, ran past the hunters and finished.
Final score was 11,891/8,000 so plenty of room.
This alleviates the need to play on legendary which is unnecessary and may be problematic for some, and avoids the thunderstorm skull which is unnecessary here.
Here's one video for reference of a possible path, of par score on legendary:
(Courtesy of "Halo Completionist" on youtube.com)
And another video for a speed run path reference:
(Courtesy of "Nak3d Eli" on youtube.com)