[ Why is stealing energy from people such a thing with aliens and monsters? At least this one isn't ripping out organs or draining blood at the same time. ]

That's still hurting them. You'll have to find energy some other way.

[ She notices the continued effect of her torch, and thinks of the lights out on the street. Can it be lured away? She remembers something Jack did once. ]

I have a lot of energy, more than normal people. You can have mine, if you can catch me.