Not sure but critical thinking tells me it has something to do with grip and/or limp wristing. You probably have a very consistent, strong grip. You don't limp wrist so most of the force of the recoil is on the slide. The other guy shooting probably had an inconsistent, loose grip and limp wristed. When he did, force of recoil was absorbed by it.
I have lightened recoil springs on my CZs. They launch cases pretty bleep far away. I often spray the poor guy 2 lanes away with my brass. Doesn't bother me but it does make it almost impossible to collect your brass. LOL
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