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jn1 said..
It can cause panick K3K. But yes, good evolutionary reflex. Especially coming off +35kt on a stinky lake. Water tends to jet under the eye balls at that speed, and end up with pink eye for a few days. So harder shut the better IMO.
maybe im a bit more resilient because of kitesurfing (usually when you get teabagged a bit/dragged under water with modern kites it's best to try and stay calm and wait under water for 5-10 seconds, holding your breath, and keeping your eyes closed until everything settles rather than try and paniccontrol the kite which just burns oxygen and makes you breathless.
When I get burried by the rig I ust accept that, stay calm, then surface. If my head hits the sail i just go back under, tilt my neck back and just move my mouth up under the sail then breathe in. Then I have a bit of a feel to see where the boom/sail is and then surface next to the rig. If you hold onto the boom at all times you are well oriented anyway.
Contrary to popular belief not having a breath in before you submerge makes no difference - the primary purpose behind breathing in is to breathe out co2, not have more oxygen which does not make you less breathless anyway. If this is a real big issue then it's probably better to do some co2 retention exercises i.e. holding your breath for a bit while using the computer.