u/PhaseDry9309

Hey everybody i have a sony alpha7rv and a godox speedlite v860III and i would like to make pictures with flash but that the flash is not mounted on the camera but rather lose or even just handheld and that i can take pictures with the flash from the side or a different angle. So my question is what cable do i need to buy that i can have a free flash that i can put where i want it or is there a better method than a cable. I am new to flashs and i appreaciate every answer.