Select the Hunter class and go to the Industrial Port. Search for a Hookbeast and wait for it to charge. In mid-charge, stop time with the Sphere of Timelessnes trick as close as possible to the Hookbeast. This should allow you to get a few good ranged hits before the sphere expires and get a critical hit. If you did not land one, exit to the menu and choose to resume the game. Your skills will be recharged again.