I was taking photos from the first row of 444, which is even with the PV standards. I have a series that I've noticed this AM show some of the activity, taking place behind the leader (Patrick Tiernan). I was unaware of the crisis for a number of laps, until I started to hear ppl say, they're doing CRP/compressions, etc. They reflect the growing presence around Kemoy, as shown in the screens shots you've posted. The race official was at his side within one lap of when he collapsed.
Having had heart issues myself since the early 80's (PVC's), multiple ablations, pacemaker... and a very fit friend have a heart attack following a workout (he is 70) just three weeks ago, this was for me a chilling experience. Take good care of yourself, being a fit athlete does not make you immune.