H2Andy
Contributor
fldiver1:Wouldnt I then be responsible to keep another diver from injuring himself by doing a potentially harmful profile.
you would be responsible for acting as a reasonable person would under the circumstances.
what would a reasonable person do?
probably tell the guy "that's a dangerous profile; you can get hurt doing that dive."
that's about the most you can do, and then bring in whatever verbal authority you have over the guy
if you are his buddy, you can say "i'm not diving that profile; it's unsafe and you're gonna get hurt" if he insists, don't dive with him.
if you are a DM and the guy is under your care, then you tell him he can't dive that profile with you and refuse to dive with him if he insists.
if you are an Instructor, you do the same and order the guy not to do the profile or you will flunk him or whatever dire consequences you can muster.
bottom line is, you can't stop him if he decides to do it anyway.
you are not a peace officer. you do not have arrest powers. you do not have the authority to lay your hands on someone to restrain them unless in self defense or the defense of others. short of saving someone from committing suicide (such as pushing somoene off a railroad track where they are standing waiting for an incoming train to hit them), you really can't do much when someone else decides to go in harm's way and do something dangerous. you could probably be justified in stopping a drunk from driving, since other lives may be endangered.
all of this is "ifs." you really need to start with a set of facts and then analyze them.