do it easy:My mask almost never leaks, but it was leaking up a flood a few dives ago. I figured out that if I lower the strap behind my head an inch or so, the leak stops. It boggles me that it would work, but it does...
I'm sissy when it comes to mask skills- I'm always afraid that if I get a full flood, that I'll get an instant brain freeze. And, I shut my eyes when the mask is off. That's in fresh water too.
Anyhow, nice work surviving the super high intensity training. Now you're ready for Mother Ocean's next test...
Losing a mask in cold water is an unpleasant feeling. In really cold water it WILL momentarily knock the wind out of you and there's nothing you can do about that. But, I think it's important to know that though it's an unpleasant feeling that it can't hurt you. Open your eyes, get situated, get your bearings, communicate and then replace the mask. The priorities need to be that way. Replacing the mask comes last while controling position and buddy contact is first. Like they say in aviation...aviate, navigate and communicate.