Spad
That is an interesting situation you paint, and I am sure a call to one on either side would produce the same satisfactory results.
Now, right back at you - in the same situation yourself, if the only person available within range was a "former mate" now on the other side, do you not think he would do everything he could to ensure a safe outcome? I believe he would, as I am sure you would if the help was asked of you by a former mate.
Some things go beyond personal differences, no matter how deep and bitter and such a situation I believe to be one.
Looking beyond the dispute, we are all still humans Spad and I don't think this is realy a relevant "what if" as I do not know anyone in any walk of life that would not do their damdest if called upon in such a way.
Good food for thought though.
Best regards
EWL