Darn, Mike beat me to it. Honestly, I was thinking along the same lines as Mike. "Does the neutral zone dissolve? No, that's free blocking zone."
So in A, since it is a completed pass, the play becomes a running play. The basic spot would be the end of the run. As someone said earlier, all defensive penalties are enforced from the basic spot, that being where he got tackled.
In B, since you can only have one loose ball play, the loose ball here would be the fumble. Even though he voluntarily ran behind the NZ, the foul would be enforced from the basic spot, the previous spot.
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