[gassergrant]

Hi mate im really sorry to hear about your friend my thought go out to family and friends.

I was in the army and we had to train for events like this.
doing a first aid course is a good idea and could make a difference to the out come of events. we used the platinum 20mins (first aid given) and golden hour (hospital) .
have a plan of action shared in the group.ie medi vac procedure
have blood groups written down or get dog tags made.
have a gps of some type and everyone knows how to use it. fully charged phones or coms devises. share emergency number
carry basic medical equipment and make sure everyone knows who's carrying what and were.
have a torch if it get dark, spare batters, I had to signal a chopper in once in Iraq in a medi vac

sorry sound a it military but knowing and having the info will make life easier

hope this help for some idea's