Non-pilot, non-cabin crew speaking. The simple fact is that none of us know how we will react, until we look back on it.
When I was involved with various bomb alerts in London in the 1980s, I recall the events surrounding the Harrods bomb (Dec 1983, IIRC). I should state that this story is NOT from Harrods staff. I was responsible for all telecommunications, including security two-way radio. Setting aside my reaction, one of the coolest and most reliable people to help that day was the man who was in charge of the hair salon. He proved that gay man are just as brave as any man. He was public thanked and complimented by the MD.
Hope that you do not have to find out. But, if it does, you may well find that you do not have time to think about it - 'things' happen very fast.