The people in the store start to rush around them, and Eva pulls away. This isn't where she wants to have her fight. She dumps her grocery items on the floor and makes off in a huff. The patrons clear for her to leave, not wanting to be the person she lashes out at next, and move to comfort Felicity (or, more likely, get the full scoop on what just happened).

There won't be punishment for Eva, at least not with Peacekeepers around. Mentor violence isn't entirely unheard of, and the Capitol citizens don't care much for justice for their Tributes.