If you have IDPA type firearms skill, then you would certainly apply alot of that skill in a real defensive situation. How well you apply it would greatly depend on your level of common sense and measure of personal grit.
Wrestling is not combat and it isnt martial arts. Could a person who is a good wrestler manage to implement a wrestling move as part of a real defense? Sure he could. Could a wrestler be a dangerous person to engage in a physical confrontation, Sure. Could a IDPA master be a dangerous person to engage in a gun fight? Sure.
Life is a web woven by necessity and chance...