I have only briefly browsed through this thread and I don't see any comment to why the emergency slides were deployed. The opening of the overwing exit is clearly done by passengers, but what about the deployment of the slides (right front and rear left can be seen in the pictures)? I guess that was done by the crew, but was this a result of the chaos and the crew needed to release the pressure? Since only two slides can be seen; why weren't the two others deployed?