Last night, I read a horror story about a baseball coach who assaulted his star player after training because she made his son look bad as the eternal number 2.  He fed her peanuts while she had a nut allergy twice and then forced himself on her. There were several minutes between the time she was first fed the nuts and when she managed to use her epi-pen, at least enough time for her coach to feed her a second handful of nuts, drag her into the announcer's area and violate 2 of her holes.

What I found weird was that she started feeling better instantly and managed to overpower the coach, run away, ambush him and beat him to death with her baseball bat in a few minutes. She also didn't go to the hospital afterwards to get further treatment for the reaction.

I thought that an epi-pen needed more time to work, especially if there's also the stress from the simultaneous assault. I also thought that an epi-pen is not a magic health potion that removes the entire problem instantly and removes the need for a hospital visit to at least check up on things.

Does an epi-pen really work in this way, or was this a severe case of artistic license: medicine?