The RAF have lost quite a few Chinooks, but this must indeed be one of the most horrific accidents. It all goes to show the amount of energy in the transmission and rotors of a stationary helo, especially the chinook. Almost unbelievable that, despite being marshalled, they hit the walkway.
I guess the fire was made so much worse with the upright fuselage acting as a chimney. One wonders how the pilot managed to survive if it took 35 min to put it out.