WW,
All weapons not used directly for injury or death of the victim,but which are shown to the Victim are for intimidation.
I know ,supposed Gangstas,people who grew up in places like Harlem,Bed Stuy, Newark,Phili and other supposed bad areas and many train in Martial arts to use it as a way to stay alive or get out and they tell of how and why things are done.
When an attacker/gangsta has a pistol for instance they run up on the Victim and strike them one OR MORE times in the head to get their attention,instill immediate dominance ,instill fear and gain compliance.They do not stand at distance in a proper shooting stance as they are not interested in shooting the victim they are interested in using overwhelming force and fear to get what they want.They want to gain attention,put the pistol to the victims head and they get in close,face to face to snarl,spit and make the demand,so the pistol is up and pressed to the side of the victims head,elbow up,hand turned ,pistol grip turned.
The Intimidation method became a way of firing on the street but that was not the intent of the gangsta position of the weapon.Firing like that is not for accuracy but to lay down rounds and who ever gets hit gets hit.This is why in many gang shootings more bystanders get hit than the members of the other gangs.
If we think back this method of firing has been around since Firearms have been around.
Rifles were fired in WWI-WWII-Korea-Vietnam and even today in Iraq and Afghanistan in this manner as the shooter is behind cover,knows roughly where the enemy is ,they raise their weapons over the cover,(which is rifle turned side ways),or the weapon is turned around a corner ,held side ways and they fire to put rounds down range at the enemy.
Side ways firing is not for accuracy just to throw rounds towards the enemy.
Side ways hold at very close range is for intimidation,elbow up and weapon high to make trying a disarm or grab of the weapon and or weapon bearing limb harder.