Both the good guy and bad guy are moving...bad guys at full speed falling down...
Not sure caliber would have made any difference. Very few people get to practice moving shots, particularly when both parties are moving, adrenaline pumping etc. It is hard to hit someone. He got one in the arm, and the other twice near center of mass (leg & hip). a 10mm hitting arm, leg and hip would not necessarily be fatal depending on angle of entry.
Our good guy was controlled throughout...amazing!!!
And yeah... You catch a magnum class pistol round on a major body part and you are going to have serious issues to deal with. Shoulder shot a feral hog with my 10mm once... I know exactly the kind of damage it can inflict. Didn't ruin the bacon, but it was DRT just the same.