This was taken during the band introductions. When Glen was introduced, he ran down the stairs and off the stage, back into the crowd. Then when Lawrence was introduced, he went to the top of the stairs and stood there, blocking Glen's way. Glen was laughing and pacing back and forth, waiting for Lawrence to move and let him back onto the stage! JY is pointing at Lawrence but grinning at Glen!

The blue blur is JY... I'm not sure about the white blur and red blur! I just thought it was an interesting (unintentional) effect for the times.