Incredibly dangerous "sport" I've been skydiving and I think even that is something that should be done sparingly, wing suit flying is basically playing Russian roulette.
He oughta take it a little easy. He may be the best bush pilot this side of Mos Eisley, but those little wingsuits are dangerous. Keep it up, one day...Whamo...he could end up a dark spot on the downside of a canyon wall.