Apparently there was some sort of glitch with the floating stage that is used on the On The Run Tour because stagehands were quick to "rescue" the Queen B from the stage after it malfunctioned. The floating stage somehow got stuck in the up position and stagehands rushed to make sure Beyonce' was all good.
Normally Bey exits the stage gracefully as only she knows how, but unfortunately she had to walk down a ladder that was about 15 feet high in order to make her exit. I know mistakes happen but I'm sure this threw off her flow, and as you can see on the video she seemed to be a little hesitant in going down the ladder although she had plenty of stagehands to assist her. The good news is that no one was injured and she still reigns supreme as the Queen!