Zeev,
re: In the last twp hours, call buying was twice puts buying, and even during the depth of the early decline, put buying was lagging calls.
There is no way to tell if the put and call volume was buying or selling. Reviewing the day end OI ratio change will give a hint, but you can't pin point interday action.
You can use the put/call ratio as an indicator, but very often the volume can be traders either closing option contracts or shorting option contracts. So it's not a clean sentiment indicator.
John