There is a device called a netti pot which is used as a sinus flusher which pours warmed salty water through the sinuses one side to another and out. Can helpful in chronic sinus issues. You just used the ( insert name of ocean) natural method.
If you are squeamish about being snotty in the surf, wait till you have your retained Nasal flood flow forth in a social or business setting

Go with the flow happens to all of us! If you see blood or get severe headache see an ENT doctor, especially if your nose has been broken sometime.
BTW, there many a surf video of surf hero pulling off a wave after a ride, doing the close one nostril flush the snot pullout! Cool no finger involved
