So I'm going to be creating a file that uses the player's thumb to control a sword on screen at an off-set. It's not using the drag behavior, but when in touch, the sword is to mimic X,Y coordinates of the plalyer's finger at an off-set. I would like to measure the speed of the sword that is in control of the player's finger, so I can decide whether it was strong enough to "Cut" something, but i do not know how, any ideas?