Durham wroteI am gonna have to go with live. A screwed up with a live clock and the flag was at the snap. mark it and chop it and if they are smart they will get the play off.
Although the flag was at the snap, the down continued and ended with a score.
As a general rule, ask yourself what happened during the down to kill the clock. Since the down ended with a score, the clock will wind on the snap.
If there had been a false start penalty, then you'd be right to wind it on the ready.