Originally Posted by bhupaes
Biomechanically speaking, I believe this is a loading mechanism that everyone probably exploits instinctively, and Oscar simply was observant enough to notice this happening. The pushing up or back off the front foot that precedes or coincides with the forward swing will activate the stretch-contraction reflex in the shoulder, providing explosive power for the forward swing.
While we understand what you are saying here, this part is not technically correct.
No ssc action would be contributing to power while pulling back on a 1hbh. ssc is triggered by a stretch in one opposite direction and then a release in the opposite direction.