Kudos to all involved in this, as it seems everyone did all that they could to save him, and my heart goes out to his family and all that were involved - you may think you can handle the emotional pressure of a situation like this, but I can tell you from experience it is very very tough.
I'd like to chime in here for a minute, but only to say that people are often revived when it seems apparent that they are gone; I referee amatuer and professional bicycle races (on a motorcycle) and I've had the unfortunate experience of seeing people suffer heart attacks while riding/racing. In one instance we had EMTs on site in less than 90 seconds, doing CPR, to no avail; on another inceident several nurses that were on the ride started CPR by the time I got there, and to my eyes, the rider was gone - completely limp, no pulse, eyes rolled back, etc.
But they (the nurses) never gave up and he was transferred to an ALS unit who (amazingly) managed to revive him enroute to the hospital - no one was more shocked than I to hear the news.
Moral of the story - never give up, even if the patient is unresponsive and appears dead.
KevinL