Pants on the ground, and rounds jammed in the action from reducing the feature of a semi-auto pistol, whose reloading mechanism is powered by the recoil with weapon properly restrained and not “limp wristed” one hand shooting— or sideways shooting. Sideways results in the muzzle traveling horizonally between shots, thus very poor aim is a result.
One never sees professional shooters on a range in competition use a sideways hold for firing. The recoil is reduced and chambering the next round is hindered. IOW it would cost time in the shooting to clear a jam and/or load a new magazine to continue. And another IOW—it’s really stupid. Only possible use would be a slight cant (called “the half homie” held in the weaker shooting hand.