TL:DR My Co worker needed help moving something so I went and helped. It took about 5 minutes to do. A customer was waiting in line when I got back, even though there was another line. This wasn't the first time she's shown up and she buys the same things and says the same things. Yells at customers, employees, and my manager. After me “Abandoning her in her time of need” My manager decided to give her a coupon for her “Troubles.” I got fired for “Keeping her waiting.” The man even threatened to withhold my pay. What do I do?