I mean tahts your interpretation. Maybe they were going through the workings on the result?
I'll be honest, I'm not convinced all the working should be shown. It's pointless. If you want to show lines on the final edit then that makes sense to me, but in terms of the workings, I really don't see anything to be gained from that.
In all likelihood it is perfectly innocent. It is a guy getting to the final and correct decision. It's easy to make out there is some untoward reason, but there is no benefit to be so. It just takes a bit of time to arrive at the correct conclusion.