Brazilian Jiu Jitsu has taught my brain how to keep my body moving even when fight/flight is in full effect. You can understand things are going to hell and lessen the effects of the hormones. There are situations where you literally feel like you have to shit your pants in BJJ. Knees on the chest, chest compression moves, etc. it hits the CNS hard. You learn to be calm and work through it. Panic means you will actually shit your pants or lose the position / match. You effectively learn to operate in the worst situations. It all comes down to training really, and pilots have a ton of it for just this reason (operating in unexpected and bad situations).