Reilly McGlashan in my opinion is one of the best free skiers in the world. He's the next generation of Richie Berger type free skiers.
If you look at both bodies from the waist down, almost identical.
Harald makes sure with this presentation, his shoulder and arm action never contribute to rotation.
Both skiers hold their countered hip, and shoulders, during their transitions.
Harald: "I really like Reilly's inside arm discipline, it's better than mine, even though inside arm and pole tip forward, is a big PMTS goal. Reilly's release also has more, "jet", he really let's his skis explode forward at release and catches them, pulls them back for tip engagement before the next arc. This is very athletic skiing. I tend to be more absorbing of energy, probably due to my old knees and having less strength than Reilly."
I have to ski more in the center of my skis and even more centered and forward on my skis. Reilly with younger knees can take more chances with his release, by letting his hips drop at release.