Give the boy a saddle, rope, and some training...he's maybe 1/10th of the way to doing real tree work. Maybe.
I've seen a few souls, climber trainees, that were happy to move around all willynilly under 25 feet off the ground, like this fellow...but put them only a bit higher up, and all the fun and joy comes to an end.
At 100ish feet the rubber meets the road, I have often seen. At 200+, even seasoned climbers unused to that level of exposure can get the shakes.
But I have noted that above that level, it doesn't really seem to matter. 300 feet is not any more difficult than 200, for those climbers that handle the former with comfort.
And then there are the incredibly few who, like our founder Butch, the Masterblaster, could cold climb an antenna tower to 400 plus feet and call it fun. I'm sure he could have worked high iron, building skyscrapers in New York or Chicago back in the day.
Not me. I'm a wuss on exposed edges, without protection. Somehow, trees are different for me.