The gears turning in Pratt's brain made of leftover stew are probably actually visible.

"That's why the ghosts are still in the ship huh? They can't... actually die. They're trapped." He considers that for a moment, "That must be why they're so fucking pissed they don't even get like... to die and have this be over with. But if they're not dead, why can't we you know.. bring 'em back?"

And why does everyone keep yelling at him for suggesting necromancy???