[rio517]

I don't know.... I would imagine they have a lot of control. After all, the engines nozzels rotate. The entire areas was empty of people and they were aware of the high probability of an explosion - potentially before lift off. There was a ton of assumed/acknowledged risk, all of which was eventually signed off on by Nasa(?) and the FAA.

[reso]

They did not have control of the blast in the way that all other commercial launches do: with flame trenches, water deluge systems, etc.

If the FAA knew that SpaceX could be throwing bus-sized pieces of concrete in the air that could potentially hit the rocket's fuel tanks, I guarantee they would not have approved the launch.