Murphy still lives
A year or 3 back an implosion in this nations fair capital was treated as a public circus. Perfectly safe said everone, although the family of Katie Bender (12 years of age - more than 400 metres from the implosion) probably no longer believe this. She died when the implosion went slightly (horribly) wrong ...
Motorbikes and helicoptors makes for an impressive stunt but not something to be conducted without a very large safety exclusion zone. I don't know the number, but I wonder what the lethal radius of debris would be? Certainly the photopgrapher and the observer, probably the camera angle we see it from, and the people he rides past to get to the ramp, and possibly even the ferry a couple of hundred metres away on the harbour.
Risk assessment - what can go wrong, the likelihood of the event occurring, the impact if it does. Engine stutter on motorbike 1/2 second before leaving ramp. Highly unlikely. Probably multiple fatalities if it occurs. Rating: high risk. Risk mitigation: large exclusion zone (and probably not on Sydney harbour shoreline).
regards
layman