He looked high on drugs during the show. I was watching the performances and he looked overexited during the whole thing and he messed lots of stuff while others looked in control of their actions. May be it was too much for him. BigHit wants them to be perfect every single day but they are not robot machines, they are human beings and have personal problems plus all that pressure of being on stage (constantly) and millions of people watching through microscope their every single move and if that's not enough they have abusive manager who probably beats them, puts them through some kind of electroshock therapy, drugs them before going on stage, humiliates them, sleeps with them, makes them do satanic rituals and God knows what else. Everyone would go insane if put through these conditions. It will be a miracle if they can recover after their contracts end. I wonder how their lives will evolve beyond bts? :/
P.S. - Marry Christmas Everybody <3 Hope the new year brings you only joy and happiness and all your wishes come true <3