If the diver had suffered laryngospasm, what he/she would report is an inability to inhale at all, not that inhaling resulted in a mouthful of water. Someone suffering from laryngospasm cannot move any air, or can move it only with great difficulty. But laryngospasm does not prevent a regulator from purging normally, or cause one to inhale water. Neither does overbreathing a regulator. If the reg is purged properly and the mouth is sealed around the mouthpiece, inhaling should result in air flow. Now, if the mouth is still full of water because of improper purging technique, then a second attempt to inhale could result in water in the larynx again. Maybe this is what happened?
