As a junior developer working on a rather complex system, I find myself in this situation constantly. A fellow programmer is explaining a topic that is relatively complex but I am following along with their thoughts enough as I deem appropriate.
But then they'll mention something that I'd like clarification on and would like them to explain, even if it may only be tangentially related to the big picture. It's like that minor point has acquired an exclusive lock on my cognitive reasoning ability. I just want to know how THAT works.
However, they are on a roll explaining the system, while I can't seem to stop thinking about that one thing that's confusing to me. Should I be interrupting more often or should I work on my own inability to let little things go and try to focus on just picking up the gist of what is being described after a snag point?