Both Hands are needed i said,power can come from either hand upper or lower
It is a two handed rod after all. You didn't specify what they were used for so I assumed you meant power application.
He is a good caster and he does say the word pause. From what I can see in the video he is raising his two hands up into position during this 'pause'.
To stick with the same caster, there is a nice snake roll at 1.00, the micro second where it could be argued that there is a 'pause' with the arms, you can see he is transitioning into the forward cast with lead coming from the body. I wouldn't consider that a pause.