Npc bug?

when i spawn a npc and kill it i cant remove it nor use my phsy gun to pose it. is that normal or is that a problem? this happens to all the npcs i spawn.

This is normal. If you want to pose it, Go to the spawn category “HL2 Characters” and spawn one from there.

what about being unable to undo the dead npc by pressing z?
its like i cant do anything with it at all after its dead