GOOD, now what?

I have discovered this saying by Jocko Willink while reading Tools of Titans by Tim Ferris and it has forever changed the way I approach interruptions, unexpected requirements or emergencies.

Things that happen during software development:

These are the things that are off the top of my head but the list goes on and on. How are ou going to use the newly freed time because that one thing is no longer happening when it supposed to be happening.