In a way this thread accentuates the great difference between divers.
Unless I'm on a work trip and I just dive with whatever charter can fit me in, my typical dives are from my boat or 1 or 2 local charters that know me.
Diving with the local charters I go solo unless my husband is with me, during the dive I will make a point to stay away from any other divers of the charter, if I see anyone getting close I change directions or speed up or whatever in order to avoid them. I don't like strangers in my dives, don't wish anyone harm I just like my space.
Even diving with my husband or the few friends I have, I'm not a buddy. I'm just not, of course if I see them in trouble I will help, but chances are I won't see them, because I don't look.
Diving off our boat it is impossible to run into another diver, we make a point to not jump in if there are any other divers in the area.
So now I read of solo divers than encounter others with some sort of frequency. To a point that planing for a possible encounter is an actual consideration... to me is just unfathomable.
In all my years diving I have never given any of my air to anyone, I have untangled monofilament from many sea creatures but don't recall ever helping any diver, I can not predict for sure what would I do if a situation presents itself, but I'm certainly don't care to prepare for the possibility of a stranger interrupting my dive