You can see the moment at which there was no further debate as to what to do:

Which is further evidence that it is economic nodes and not miners who control Bitcoin. In this case, there was mt. Gox with like 80% (educated guess) of the economic activity of Bitcoin at the time. So a miner (pool) switches to follow the will of the economic nodes (i.e., whichever side Mt. Gox was on), even when that one pool alone had majority hashrate (both sides combined).