No it isn't a sin. I'm not a physicist but someone pointed out (here) we would be occupying some space time regardless..
Zor explaining the air movement at the front of the vehicle was interesting and Had me think of the back of the vehicle And, how when we were kids we'd ride our bikes behind trucks and cars for the same reason Even grabbing on not relying on the draft
Know why the Raven didn't use the back draft? He'd been exhausted.