Not to be a lore police but...

Technically it's supposed to latch onto the "crew mates" head as seen in the half life franchise which the "bed crab" is based off of, it's a reference to the headcrab enemy seen in hl and hl 2.

But hey, that's just a theory. A GAME THEORY

The reason you don't see the crewmate body is that the whole background is the crewmates body

No

Is the crewmate good?