One thing doctor, and to a lesser extent lawyers, have to do is project confidence when they may in fact not have much. A doctor/lawyer regularly has to quickly become an expert on a subject, or seem like one, often overnight but sometimes much faster than that. Briefing something you are still new to, without getting it horribly wrong, is a skill that must be developed.

I run into this in the military too. "The person to do the ethics/roe/safety/drugs/mental health brief just called in sick. Two hundred soldiers will be here at 0800 tomorrow. Read fast."