What is the dumbest ways that Halo characters died to in your opinion

Here are my picks for the worst deaths in Halo.

Xytan ‘Jar wattinree was the Imperial admiral of the Covenant before the great schism where he was exiled and was shortly killed by a curious engineer activating a nova bomb on his ship. Kat could literally avoid getting shot by the Field Marshal if she had her shields active. The Rookie was killed by an insurrectionist leader. And Jul mdama was killed because 343 tried to make Locke look badass even though Jul was extremely skilled and intelligent.