Yes, you guys are right in what you're explaining. It was sort of a jump or spin move but by clearly picking up the front foot first he got the runners to bite on it, thinking he was going home.
I wasn't sure it was a balk when I saw it. At the very least, I thought it was some clever teaching by the pitcher's coaches. Seeing the runners' reactions it was clearly effective in getting them to move toward second.
Thanks.