The A.I seemed smart to me, dregs would lure you into ambush, and the flying thing would flank the -blam!-ing shit out of you if you weren't paying attention. And drowning makes sense to me, all the planets have been terraformed so you don't need a space suit to breathe, which means our armor probably isn't air tight, and idk about you but I'm -blam!-ing drowning in a couple hundred pounds of armor and weapons.