This is what I meant by bravado. The implication is that the donating diver is some hard as nails superstar who can manage without gas.
Have they practiced having their primary stolen without notice? If so how does that work? Is it like testing for witches?
I am deeply sceptical of people that say ‘take the one from my mouth’ and sometimes I am tempted to randomly mug them mid dive to see how they do. However I would risk drowning them if I was right and I am not sure how that would go down with the judge.
Can anyone tell me of an agency that is ok with taking regs without notice?
I practice primary donate. I make sure to have stopped inhaling and to have located my secondary before I remove the regulator in my mouth. How similar is that to having one stolen where I might be inhaling or have misplaced my secondary?
Every diver is trained to signal to request the donation of air - no diver is going to fail to realize how incredibly "rude" it would be to just snatch a reg from another's mouth.
Perhaps your injection of the bravado claim is associated with the comment about a pre-dive communication that: "you will
take my primary in an emergency"? Of course nobody wants a reg ripped from their mouth. If the mouth piece is weakly attached, the mouth piece could remain in the donor's mouth and the victim, would be getting a reg without one - not good. It could also quite possibly result in the flooding of the donor's mask at the worst possible time - also bad. I view it this way: if a diver is reasonably calm, he is going to signal his desire to acquire a second stage, if so then a donation is made. If the diver is panicked - he is going to TAKE what he sees.
If I were in need of an alternate air supply, and the buddy was not using an AIR 2, then I think I would initially try to secure a safe second which was attached on the triangle or something. But in the back of my mind, I know that if I were really in trouble, I would be going for the reg which has bubbles coming out of it. I don't think that is a claim of bravado, but rather an acknowledgement of the natural survival instincts of humans.
I just don't get the superstar theme which you seem to be interjecting here. As I think about it, the "superstar" attitude might be more applicable to people who claim that they would never "allow" a reg to be snatched and they would successfully fight to retain possession.
If a diver is coming at you with eyes bugging out and no reg in their mouth, you better be working on getting something ready for them to use before they arrive. If they "attack" from above and behind, nobody is going to be retaining a regulator when someone grabs that hose.
If you want to test if someone (presumably a regular dive buddy) is really prepared to do primary donate, why not approach them from the front, with your regulator out of your mouth, gently grab the hose of the primary and you should instantly get feedback about whether they are going to "spit and release" or if they are going to start flailing around? You might get a forearm to the face, but at least the both of you are going to have a better understanding of the other diver's skills.