Even though she seemed to be disturbed by his actions, and it was clear that she didn't like them, she still looked at Eric like he was harming her, instead of helping her.
Huh!? Wasn't he supposed to be helping her!? Just what was wrong with this girl!? Why was she looking at him like that!?
Furthermore, at the moment of the clash with the middle-aged fatty, Eric had felt a strong sense of strength from the guy, as he was clearly just taken by surprise.
It was clear that there was more to this than met the eye, but Eric wasn't really interested in it. And seeing that look in her eyes, he decided that it was a mistake to get involved deeper into this.
But sometimes just releasing the bull's horns doesn't mean that the bull will let you go, and the same thing happened to him.
The fat guy he pushed away, turned back to his standing position pushing away the people that blocked his way, even though amidst curses, and swearings.