>>5969740>>5969640Humans don't pose that way, especially when shooting a gun, because it offers no real support and is awkward to get into.
Wide stances like this are the most common, which is likely the same stance that Harrison Ford is holding in that promo photo. Knees are bent for scooting and shooting. It's an action pose.
Unlike that unnatural flared dancing pose with the Death Trooper, which would impair his mobility.