 In an appendix to his thesis, Mahood argues that the unexpectedly small magnitude of the results in his experiments are a confirmation of the cancellation predicted by Whealton; the results are instead due to higher-order mass transients which are not exactly cancelled.Mahood would later describe this argument as "one of the very few things I've done in my life that I actually regret".Although the momentum and energy exchange with distant matter guarantees global conservation of energy and momentum, this field exchange is supplied at no material cost, unlike the case with conventional fuels.