ARGUE:
Version 1: The fingers go up and down together:
Version 2: The fingers uses an alternating movement.
Interesting note: I found that when I signed version 2 to myself "off camera" I tended to open my mouth and cover my bottom teeth with my tongue. (Which is to say, my tongue was touching the back/inner part of my lower lip but not protruding out of my mouth. But I didn't use the tongue in the first version. I'll have to video other people signing these two versions and see if anyone else does that.