I know we've been through this many times before, but also remember that you only get horn continuation on a try. In your case, once the ball hit the floor, the try ended, so if the horn went off anytime after the ball hit the floor, it's a dead ball. Similarly, if the horn went off before the ball hit the floor, then the ball becomes dead at that point.
In my explanation, try and tap are the same.
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Yom HaShoah
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