Pinstripe Potoroo is actually the second easiest boss fight in the game. When you start you'll be crouched down behind a chair and this is where you'll hide for the entire fight. During the first 3 health sections, you need to attack Pinstripe as he switches sides. Afterwards Pinstripe runs around shooting, wait until his
Gun Jams then run up, spin him, then run back and repeat this process until Pinstripe is dead.