Hiking with my hiking group – Mountain High Hikers.  One of the men got really cold and collapsed on the trail and had trouble getting up again.  We applied hand warmers all over his body and wrapped him in thermal blankets.  No one had cell reception so I activated my reslink.  Several of us walked back to the cars and called 911 while the rest of the group stayed with Bob.  He is the one walking with the rescue personnel–he has an orange hat on.  When they got him back to the cars – they checked him out and released him.