Incident on the surface - mCCR

If in calm conditions I'm happy to go off the loop and breathe ambient air, knowing that the loop is full of high FO2 gas (and getting higher as O2 os still on on my Kiss). If I Need to be on loop eg bigger sea, then checking PO2 frequently and keep loop volume high by adding O2 whenever it drops at all (not staying at min loop vol).

A separate point at least for the Kiss is that jumping in, or backward roll off a rib sometimes seems to activate the ADV, I presume sudden water pressure against the ADV membrane does it. This can abruptly lower your PO2 especially if using a hypoxic dil, so check as soon as you are in the water even if your loop was full of O2 when you jumped.

Neil

there are plenty of folks who have drowned, particularly on OC because they did not have the regulator in their mouth at the surface and for one reason or another lost buoency.

In weighing the potential hazards, I have decided to err on the side of being on the loop till I have a firm footing on the shore or a ladder. I try and remain in the head space that i'm diving, weather on shore or in the water, as long as i'm on the loop... there is no in between for me.

During a rescue where your only escape from a rabid diver may be descending to get out of their reach, you may not have the time to get back on the loop and can all too easily get caught up in the fray.

During my DM training, we were doing rescue drills and my instructor was the victim. In this case he made the drill very realistic. When I approached him without the reg in my mouth he jumped me and I got to see how easy it was to become a victim myself. I took on water and chocked pretty good, in the deep end of a pool... I'll never forget that training experience, sometimes the best way to deal with such a frantic person is to stay on your guard and be prepared to exit, the only way you can, to descend and you never know when someone who seems calm is going to panic. My instructor recommended a lot of caution in this area, even to let a frantic person get warn out and in the mean time to "lure them to safety" by keeping a safe distance (even if that means getting below and in front of them under water) while swimming toward shore/boat.

I'm thinking the same would apply to CCR rescue, no?