Reason I ask is that it is decelerating as it goes up the ramp (whether due to a loss of speed due to the incline, or braking/reduced power).
And the noise doesn't decrease or change in pitch which suggests the throttle wasn't suddenly closed.
Could be a multiplicity of factors in play.
Although they're heavily trained not to - pilot startles and doesn't react quickly enough to insufficient power?
*If* it's an ingested blank, it moves suddenly during take off roll and degrades thrust?
Will be a very interesting accident report.
Not blaming the driver - just trying to understand the possibilities.