Note that I'm not necessarily opposed to her facing consequences for killing him -- my issue is with how gleefully NYPost is framing it as if she just attacked him out of the blue and shoehorning her into the "evil transgenders" stereotype
Technically you aren't allowed to stab until they stop moving, just until they are no longer a threat. Stab em in the leg and run. Self defence isn't a license to kill it's a way to not go to jail if killing was literally the option available.