It's impossible to answer questions like that. Depending on a lot of factors, the response could be anything from "do absolutely nothing" to "ban both users".
Community management and moderation aren't simple, black-and-white decisions. Anyone that claims they are has never been involved in doing it at a meaningful level.
Community management and moderation aren't simple, black-and-white decisions. Anyone that claims they are has never been involved in doing it at a meaningful level.