Correctable Error

[Brian S]

The error must be recognized during the first dead ball after the clock properly started.

So, if B1 shoots a free throw before the error is recognized, it's to late for the error to be corrected. Correct?

Another question:

Rule 10-10-3 states: "If in article 1e the error is made while the clock is running and the ball dead, it must be recognized by an official before the second live ball"

I don't understand how the clock could be running and the ball dead.