Nobody Knows...
Part of the problem is - Nobody Knows!!
We all hope that we will behave in the highest tradition of excellence, should it all go pear-shaped. We base this assumption on the intermediate level incidents that happen all the time, and that we deal with - Heart Attacks, Precautionary Landings, Mod/Severe Turb etc. etc. But the truth is that we don't know for sure.
Sometimes people can surprise you: I well remember a Purser renowned for his stringent emergency questions at the briefing, and an overall attitude that was red-hot on emergency procedures and took no prisoners. I always thought he was way over the top. Sure enough, come the day when he had an engine failure and precautionary diversion, he panicked.
It's the quiet ones I like: They tend to get things done with no fuss or feathers, and tend to do so consistently and reliably.
The AF crew in YYZ last got the chance to find out the truth - and can, to a man/woman hold their heads high as a result.