in my opinion, i will choose the first one, i think the regulation of the art is we train that "things" until it doesnt exist, 2 seperate things has become a thing. i think sine-wave is a good technique, it helps to create the impact in a small distance, there is some similar part if comparing with the taichi, even in the traditional chinese kungfu, we do the opposite way before we are going to a direction. that is what i think.