One thing to remember in a double violation situation is that things depend on who violates first. If B3 moves first, then you have a potential violation (fist out!). When A4 then moves, you have a double violation. However, if A4 moves first, then you have an immediate violation. Even if B3 moves just a moment later, it is not a double violation---the ball is already dead at that point.
In the case where there is another free throw to follow, the penalties are exactly the same---cancel the current free throw and shoot the next one. However, if there is no subsequent free throw, the penalties are different---go to the arrow for the double violation, give the ball to B for the single violation.
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