A lot involve him walking and talking, then arriving at his destination (or the point) at the right moment.
I reckon that could be why his delivery can seem odd. Trying to get the timing right.
The clapperboard bit is probably to emphasize that it is one take.
(, Thu 1 Jul 2021, 11:39, Reply)
Although, for the record, I don't find his delivery to be odd.
(, Thu 1 Jul 2021, 11:57, Reply)