Clock Management

[sorrydog]

This was a recent film review we had on a 6-man crew 2 weeks ago that seem to have some issues with end of quarter play. This play was even on local news and had a pretty good replay. Give me your thoughts:

5 seconds left to go in the 1st quarter and a 6-man crew. Play had been stopped for a foul and will start on the ready. Ref starts clock, Offence is line-up and horn sounds but no one stops the play. It appears (most all agree) that ball is snapped “AFTER” horn and offence runs 40 yards for a TD. Head coach for defense team is going nuts on the field (rightly so it appears).
Referee, Field Judge and Line Judge have a conference. According to some crew members on this crew, the Ref blamed the LJ for not killing the play and play stands. Now keep in mind that there was clocks on BOTH ends of the field. Some have stated it should have been blow dead by the FJ. FJ stated play clock was irrelevant at this point and watching his wide-out key. Most others said either the Ref, Umpire or BOTH of them should have stopped the play. I tend to go with the latter group.
So who do you guys think has the main responsibility to stop this play since clock ran out?