You need to keep on reading the rest of the posts. At post #31, on page 4,
@leadduck who dove there 2 weeks before the accident mentions “....The guide was sentenced because he left the victim at 36m. According to the expert witness the victim was overweighted but the guide could have easily inflated the victim's BC; there was no technical problem, the guide just didn't do it and went up alone.
Although they had paid the guide for the event, I don't think that it was relevant for this particular case. Any diver deserting his buddy in need for no reason would've been investigated for involuntary manslaughter. It's because team members agree to help each other and the victim accepted an elevated risk because of that agreement....”