murdrcycle
Contributor
If a random diver signaled OOA and grabbed for your octo, believe it or not under the general rule you could withhold it, and point and laugh as he drowned. No duty owed, no rescue required.
This is where you are wrong - if a random diver grabs for your air and you withhold it, your actions are now causing the injury and you could be tried for murder. If the person tries to get your air and you block them that is totally different. However, in a black-and-white world, you are under no legal obligation to lift a finger to help them. You can't stop them from getting your spare air, but you aren't under any obligation to swim over to them, pull the regulator out, and hand it to them.
Scary but true.
And no, a samaritan isn't just a bystander. As you can see form my previous post complete with supporting documentation, a samaritan is anyone except those whose jobs call for such actions and who are, while either on or off duty, acting in the capacity of such a job.
For example, an off-duty doctor who isn't on call and is out to eat with his wife (or husband) has absolutely no responsibility to help a fellow diner who chokes or has a heart attack, not even in Texas.
Now, the one stipulation that we did have in motorcycle riding is that we couldn't create a rule, like no wheelies. If we created a no wheelie rule, we were in effect offering an implies warranty that all riders would be safe from wheelie related accidents. So I guess if an off-duty DM, a Rescue Diver, or even a dive buddy told others present that they would watch out for them and make sure nothing happens, now maybe they are offering some implied warranty and have an obligation to provide said assistance.