Chopping clock vs. starting clock

[Danvrapp]

For the sake of argument, lets say Team A 50, Team B 49.

Team B throw-in under the hoop in Team B's back court. .9 seconds on the clock. B1 heaves the ball (which A1, who's guarding B1, tips) and throws all the way to the front court, where B2 of course launches a quick shot, ball goes in, and the horn goes off.

A1 immediately looks at me and asks why the clock didn't start when she tipped the ball--there's no way it took less than .9 seconds for the ball to make it down court and for B2 to sink the shot.

Let's also assume I chopped time when she tipped it; but, of course, the timer wasn't watching me, just B2.

Didn't happen, but I was thinking what I'd do if it did. Should I have enough in me to wipe the bucket because I have definite knowledge of the clock?