Looks like Vertical and Id imagine his left wrist is breaking.... loss of Rhythm. Horizontal would allow you to maintain the flat left if you wished. We talking practice...d compression leakage here. I know VJ Trolio and Lynn have a video on this site wherein VJ expresses some distain for this method... well for those who are still in the process of training the flat left wrist, but I see it on tv a lot and Yoda does teach it.
First you learn the flat left wrist , Horizontal and Rhythm then you learn how to employ a loss of same. Even a topped shot has a use around the green . The shank stands alone perhaps as the only impact dynamic that can't be of some usee. Comic relief maybe?