Regarding the definition, one pilot for the purpose of flight, etc, I'm pretty sure that the pilot wasn't planning on the Helicopter flying at that point in time, therefore he didn't need to be at the controls??
But Bob is telling us by both his quotes and links;
"Flight time means: Pilot time that commences when an aircraft moves under its own power for the purpose of flight and ends when the aircraft comes to rest after landing"
"The ac must have a minimum crew of one pilot in RH seat"
(Remember: The FAA state "Crewmember. A person assigned to perform duty in an aircraft during flight time.")
There is no mention anywhere of whether or not there is an
intention of flying, just that (by using Bobs own references), once an aircraft is capable of flight under its own power, until the time that it is no longer capable of flight under its own power, it is to be considered to be 'in flight time'.