[Adam]

1. The horn rules here, not the clock. 0.0 seconds could mean anywhere from 0.01 to 0.09 seconds.
2. Without definite knowledge, you can't do anything.
3. See #2.

With .7 left, nothing you can do. There is no way my internal clock can be accurate enough to overrule the clock operator if he's even close to starting the clock correctly.

With either .5 or .7 seconds, as the administering official, I'll count to one second after the clock should start. After a second, I'll kill it, because I will have had definite knowledge.