Paralyzed actors greet the player
Hisin Deep-Raed (
coc "-5,6") is supposed to be paralyzed as a part of his quest. Though he cannot move or turn, he still greets you with voiced dialogue like any other NPC when you approach him.
I don't know if this behaviour is specific to just him or applies to all similar NPCs, though I could not find any other NPCs in the same situation except for Mastrius who seems to display a very different and weird behaviour even in Morrowind.