We will control the spine and monitor the patient for a developing head injury. We will RICE the shoulder. Local EMS/SAR will be contacted and we will await their arrival and support their evacuation. We have log rolled the patient onto a foam pad and are using a cervical collar improvised from a pile sweater and head blocks from clothing-filled stuff sacks to immobilize the neck. We are monitoring for vomiting, change in mental status, and bodily function needs.
The local SAR team responded in an hour with a initial group of three rescuers. They were shortly followed by an additional four folks with a wheeled litter. The patient was evacuated on this litter with spine precautions (the SAR team did not have a selective spine immobilization protocol), and with the assistance of the leader and the students.
The evacuation was uneventful. The patient continued to have a headache and complain of nausea and vomited once. He was evaluated in the local emergency room. He did not have a spine injury but was kept overnight for observation for a mild head injury.
The leader and the students camped at the road head, sad they were not further in the wilderness, but happy with the experience they had gained and the help they rendered the horseman, and full of pride from the compliments of the local SAR team leader.