swain can use ulti while charmed

Played a game and was watching the replay, swain killed ahri while still under charm during the last quarter of charm... not sure if this could be a replay bug but it showed swain as being charmed on his buffs debuffs bar, as well as the damage amp debuff. and before the charm ran out he was able to activate his second instance of r to kill the ahri. again i don't know how to tell if its a visual bug of the replay client or if the debuff is showing longer than its supposed to. It would be great if we could post game replays in here so we don't have to upload a youtube video. thanks