We were there and had two rescue trained divers who were actively involved in taking care of the diver. He was being re-certed at the same time that his daughter getting her open water certificate. They were making an ascent buddy breathing. He was a healthy non-smoker who was making a buddy-breathing ascent. Apparently he help his breath on the ascent and sustained a lung-over expansion injury.
IMHO he shouldn't have been buddy breathing with a student. He is a certified diver and even though he was being re-certed, is entitled to do what he wants, his daughter is a student. If her OWSI wanted to teach her to buddy breath, then he should have been the one doing it with her, not her NON-INSTRUCTOR father. Hearing her scream "Is my daddy going to die!" and seeing him having his wetsuit cut off before being wisked off in a rescue chopper is not going to give her warm fuzzy feelings about SCUBA diving.
Call me an insensitive meanie, but their OWSI had no business letting a student partner up with anyone other than himself or another professional for something as potentially dangerous as a buddy breathing ascent in this day and age when octopi are universally available. (Not to be construed as a swipe against using or teaching buddy breathing as an option.)
I'm sure that there OWSI feels terrible and since his student wasn't hurt, he won't be under any heat in that respect, but I shouldn't wonder if the issues listed above won't be raised.