To do this glitch, you have to buy berserk, assassin rush and a spade. Go to any of those giant archways and use berserk, then immediately use assassin rush. As your hero passes through the archway, hold the LEFT TRIGGER and DOWN on the joystick to go back through the archway. A usual sign of stopping time is rain that doesn't fall. Not all archways will trigger this glitch. The spade is used to "restart" time, when you're ready for it.