Why did Subzero leave Jax ...
.. alive?
He ripped off Jax’s arms, pushed Jax off. Then he leaves, allowing Lui Kang to eventually come and take Jax
The whole plot centered on how Sub Zero and company needed to kill everyone with that mark. That was mission #1. Why, then, would he leave any doubt about Jax’s death? Why wouldn’t he rip Jax’s head off or something, or at least check Jax’s pulse?
It’s like those horror slash movies where the heroes knock the villain out, but then they refrain from killing the villain. Except the roles here are reversed, with the villain making the dumb mistake