Arm/ body part cut-off

So a light saber cuts a dudes arm/ body part off (not sure what part yet) something like in here: at 1:46 and when it is on the floor with his arm off at 1:51  https://www.youtube.com/watch?v=ovSLRpt0XWw

How do I do something like that? Showing his arm gone? I have never done this.

Thanks!

 

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