Demeanour

You can't control your situation but you can control your demeanour.

If you're heading over a waterfall, there's nothing you can do to stop it, but you don't have to scream and thrash all the way down. Gravity will do its thing and you'll have a wet landing and feel like you're drowning for a while, but if you don't panic, you'll bob back up to the surface and breathe again.