Are we talking about casual walking through the living room farts or are we talking about full dutch ovens, farting into the hair dryer intake when she's bent over drying her hair, etc?
There's probably also a proviso re: whether a guy stepped OB that changes the spot, but I don't know how that works in relation to the line to gain, if at all.
What if the ball had been moved backwards a foot? The spot was wrong so do you still "win" the challenge?
I think it's implied that the challenge is in regards to whether the runner made the line to gain.
Spread 'em out and run a draw to Brown coming out of the warning; it's 10 free yards and you get the clock running, which you probably actually want at this point.