I completely forgot until a few minutes ago, I did have one hiking companion rescued several years ago. (I was thinking more about myself and if I had ever been rescued so I forgot about it.)
My first High Peaks hike I did was Mt. Colden from Lake Colden, down one of the slides on the backside, up to 4 corners to Marcy and back down to camp at Lake Colden. There were 10 of us in the group and on the way back down we were strung way out along the trail and I was unaware of the drama unfolding behind me.
One of our group was ill, puking, cramping, headaches, couldn't keep water down. Two guys were hiking with him supporting him, but it was still slow going on the way down. We pumped water a couple of times and left several quarts in the trail for them. When they got back to camp I was shocked at how far gone he was. He was pale, clammy, still retching his guts up. We made some dilluted gatorade for him, but he couldn't keep it down.
One of our hiking buddies who is a doctor had compazine (sp?) suppositories, an anti-nausea/anti-cramp drug I think, and gave him one to self-administer. (We're a close group, but not that close...) We had a ranger stop by to give us a warning for having too large a group camping together and we discussed our companion's situation with him. His assessment was to monitor him through the night and if necessary, they would organize an evacuation in the morning. (The doctor was saying that he didn't have the night to sit there and we needed to get him out tonight, but I guess the ranger assessed the situation differently.)
He took a turn for the worse during the night and two guys were dispatched to the ranger station on the other side of the lake to get help before morning. I don't know exactly what happened, but they never made it to the station, but the ranger still ended up coming in the rowboat and the doctor and he took our friend to the ranger station.
I found out later that one or two rangers or associate rangers were dispatched from the Loj with saline IV's and that they administered fluids throughout the night.
The next morning I was pumping water in the river when "Airwolf" flew overhead. I ran to the dam and saw the helicopter just disappearing below treeline in the direction of the station. He was flown out to Lake Placid hospital where we met him in the morning after dividing his gear up and hiking out to Upper Works where we parked.
Altogether, I think he got a total of 6 liters of saline in a matter of about 12 hours.
In retrospect, after the experience I've gained in the intervening years, I think I would now either go back for him and the two guys to support them or at least wait for them to get down to us and hike out together. I think the group could have created a litter to carry him down to the lake and may have been able to get him out that night.
Everything turned out ok, though, and I definitely learned from the experience.