Student alert! If your defensive firearms instructor is not giving you an integrated system of firearm manipulation techniques but rather a set of unconnected techniques that don't integrate well together, don't reinforce each other, and don't contribute to your efficiency by being consistent with one another, you need to challenge those techniques.
Rob Pincus discusses the pitfalls of trying to become a “Speed Demon” on the target range. Practicing to swing through a known set of multiple targets as quickly as possible is a very common shooting endeavor, especially for competitors.
Old-school thinking held that if a tourniquet were used on an extremity wound, the injured person would lose that limb. That has been shown to be incorrect, and tourniquets are now in the first-aid kits of medics on battlefields and streets worldwide.