Aside from being a bizarre piece of role-play, it's not in very good spirit for players to pull the rug out from each other like has just happened in Bianjie.
Could the player who's done this offer some explanation as to what we're supposed to make of a post like this? In the absence of one, I'd suggest that we persist as though the violence did happen and write the follow-up post off as further propaganda. In future, it's polite to make clear the nature of the claims you're making because simply put, nobody wants to role-play with someone who is only out to one-up them.