I've heard this is a kind of symptom of people who have ADHD, some of them have grace under pressure.
I've been diagnosed with ADHD and I'm not sure I'd qualify as having that trait. So I don't believe this a general sweeping statement you can make for everyone with that, or if your boss even had ADHD.
But maybe check this out and ask if it rings any bells: https://www.nhs.uk/conditions/attention-deficit-hyperactivit...
Wow... I really should have connected the dots.
I have ADHD and recently started an SRE squad in our company since I tend to be the go-to person to fix any production issues.
I had never really thought of a connection between those two things until now.
"Are you Mr. Disorganized who shines in an emergency?" would be a not-terrible screening question for ADHD:
In war room after war room there has always been at least one person who would be categorized as 'disorganized' by their coworkers. When thrown into a stressful situation they either don't change or become more focused, while the 'organized' people crumple like tissue paper, so Mr Disorganized ends up either fixing the problem, keeping everyone on task until it does get fixed, or insisted on some process/tool improvement that made the problem easier to identify or fix.