They would just fall down , glitch for a second and reboot.
But ED-E just took a nose dive and all I can do is loot his body.
Is it just metal / animal companions that can ? Die I mean ?

It's my first companion so I don't know how it really works.

Is it because of hard core mode ?



EDIT: Never mind...found it...it's due to hard core mode...guess I just need to watch him a little better until he bulks up. ( Armor and weapons )

Yes, I beleave that is the reason.

Companions die in hardcoe Mode..

Spoilers:

Cass can also die, if you bring her to the Silver Rush.