Hermitage-Escape!
A bug caught unawares is a dead bug. With one hand Justin draws his blaster pistol, and with the other he sticks out his hand, telling the party to stop. He fires the pistol aiming for the giant centipede's head. If it hits, it's head, and a good bit of the surrounding area, will be nothing but ashes. Justin himself will be a touch surprised at just how much power the beam has.