What happened: Johnny Walker discussed his move to heavyweight during UFC 332 fight week. He said sparring at 205 forced him to pause when his vision went dark and dizzy. He added his heart and breathing felt fine and described himself as a heavyweight cutting to light heavyweight.

Why it matters: The cut explains the timing of the divisional move ahead of the debut. Fighting without the 205-pound cut removes the mid-spar fade he described. UFC 332 will show how his pace and durability carry at the higher weight.

What to watch: Walker makes the heavyweight walk at UFC 332.