after reading this junk this statement of mine comes back to me. in one small way or another these 3 added to the mix, wheter it be by responding "happy 4th" or whatever they entered into the scene by establishing themselves. i am sure if they would have kept to themselves or just reponded "happy canada day" the incident would not have occured. probably speculation on my part.
know your surroundings, be cognitive to everything and everyone.