Longtime hunters are invariably the best shooters.
Nice shot but when one has shot running deer several times one learns how to do it and it isn’t that hard.
The learning curve can be a while. Heck this one was in the wide open and the shooter didn’t have to worry about trees or brush.
I shot dozen or so deer before I killed my first one on a full out run.
I said that’s how it s done and have killed dozens on the run since.