FOLLOW UP -CURRENT FOREARM - WRIST MOTION

This is a video where I'm trying to get that forearm wrist motion going. I do it in chunks of 4 trying not to go to the other motion. In the beginning i think of it as forearm rotation ,then I'm thinking like flexing and extending my wrist. The result is close but the feeling is different and in the end i try to maintain it for a while, there it starts bouncing and feel like it want to go back to my other motion. . Whitch way is it. Does it generally look good? Thanks again!