Hitfilm Chopping arm off without going "though the arm"
I am trying to figure out how to cut an arm off with hitfilm.
I firstly want to try and make the effect work and chop off my own hand. Then later try to chop off a hand in a lightsaber battle. The problem is when recording I swing the lightsaber at the "top" of the arm. But what do i then do since I am not able to go through the arm? I have tried moving the sabre to the underside of the arm and do a jump cut. But that obviously didn't work. So my question is how would I record it. And how would I edit it? I have seen various youtube videos but those don't really showcase my use case
for example in this video
They don't show someone standing by and cutting the arm off with a blade or sword and so on.
I think i have seen some video with someone during the swing in front of a green screen and then adding it onto the footage. But that isn't really ideal for a lightsaber battle.
I hope you understand my Question