Straight up,
I believe that you are correct - it probably was an SH-60. To be honest, I don't really want to check as I don't have the stomach for it.
Assuming that it was a gust of wind, would it be SOP for anyone to be underneath them until they had come to a stop? I ask because common sense would say 'no', but I don't know if the tight confines of the ship's fantail means that some rules must be bent. Additionally, when I was doing my PPL(H), my IPs often exited the aircraft with the rotors running to leave me to shut down.
One thing is for sure, these images will certainly make me get down extra-low next time I approach a rotors-running heli.