That muscle-tensing moment in time when you realize that you are watching a disaster unfold before your eyes and there's absolutely nothing you can do about it.
An "Oh, Shit!" moment is the perfect way to capture this, but I need it for formal correspondence where the vulgarity is unprofessional.
Here's an example of the sentence I want to use:
It was not an "Oh, Shit!" moment for him, so I did not respond with an "Oh, Shit!" sense of urgency.