Hi Clint

Agree with what you have suggested.
Also…
– Firstly make sure no-one is at risk of being run over by a car or other cyclists. This includes everyone in the group and not just the injured… No harm in speaking up to tell people to get off the road.
– Anyone with a head injury can’t be trusted, they may not even realise they have bumped their head. I would not be leaving anyone who may be concussed unsupervised while they wait to get picked up.