When the Bishop used to come to Confirmation, the choir director was told to stop on THE NOTE that was being played when the bishop’s foot hit the first step of the altar. Any hymn in progress was to stop immediately, mid-syllable if that was in synch with the falling foot.
After some heated discussion, this was amended to STOP – V7-I, because even the bishop, who hated church musicians, came to realize that the gillliotin-like stop was a real mood breaker.