From what I recall, 50 said being on that small arch thingy that high in the air had him nervous/on edge which caused him to miss his cue, thus, he just walked around in the audience and waited for the 2nd verse.
Kind of fitting though. Even with the Vitamin Water deal, this was the start of when 50 gradually wasn't untouchable musically like he thought he would forever be. The mystique and appeal was starting to rub off and this clip shows it. Few years ago he owned the BET Awards.
Had everyone watching in attendance and at home just to see him like
.
This go round, many were like
. Industry and fan love can be so fickle.