In Eryri/Snowdonia National Park, Llanberis Mountain Rescue inform the emergency services of a walker with a serious laceration to his head. Helicopter Rescue 936 from Caernarfon are tasked to the incident and on arrival must winch the paramedic down in tricky circumstances, so the casualty can be assessed asap. It's an anxious wait to hear back from the ground as the helicopter crew work out a plan, with fuel and time is against them.