Those guys had been there before (2 of them had).
2 were in pretty good shape.
They went in at 2 am, not in the middle of the day.
They left water every so often on the trail when they went in so that they had it coming back out.
Don't know if you've hike to Tortilla Ranch, but I can pack in there, with a pack and water, spend the day and hike back out before 6pm. But - I don't ever do it in the summer. And, I make sure I'm in "hiking shape" before I go. And I'm over 60.
One other, important thing - in the winter, it may be 70's in the day, but, in my earlier days, when I was young and stupid about backpacking into the desert - it got so cold at night that I actually had my bag freeze to the ground, and had the inside of the tent rain - from our warm breath
clashing with the cold air outside. I have a light parka that I always stuff in my pack - it has a thermometer attached to the zipper.
If you go into the wilderness - you cannot have a ground fire, by law.
The desert is as deadly as it is beautiful.
Beth