Interesting video

[MAXFACTOR]

John,  Thanks for sharing that video link.  iT JUST GOES TO SHOW, THAT EVEN THE PREPARED ARE NOT and it takes time for experienced divers to recognize others problems.   

NEVER LEAVE YOUR DIVE BUDDY...and always look out for any signs of stress or different behavior then what would be expected.

I was very sorry to hear that CN3 is no longer teaching,  because to this day, I still believe he is the best.  Yes, it is true that he learned from the best, but I think the Student, surpassed the teacher.  That is not to say that I don't think Ron is great, but all factors considered, Psychology has to also be a factor, in the instructor I would choose.  Additionally, after the last tragic accident  we had up in Crosby, with Jere, on a rebreather, which from what I've been able to determine was DIVER ERROR,  not instructor error.   BUT....   , it makes me pause as to the attributes of that great instructor and his actions and or lack of actions after the fact which would absolutely preclude me from taking any additional classes of any kind from him. 
Last thought..... EVERYONE SHOULD DIVE WITH A REDUNDANT 30 OR MORE.   

as soon as my divorce is over,  i hope to get further instructed on rebreather and start diving again.

maxfactor