SPOOL RIDDLE - Which way will it roll?

If the rope is pulled to the left and the spool is to remain stationary, the spool must unwind to release more rope, thereby sliding. Sliding is against the rules so remaining still is not an option.

So we might think the spool rolls to the right releasing more rope. However, this will only release an amount of rope equal to the distance travelled by the spool. Since the rope is moving to the left more rope is required to be released, thereby requiring sliding. Sliding is against the rules so remaining still is not an option.

Therefore the only option remaining is for the spool to move to the left with the rope, rolling up the rope as it goes.

Dang, that's a lot of friction! (I guess that actually depends on how fast the rope is pulled)