Traditionally, that was when you called the priest over to retrieve the Host and purify the floor.
I can’t post the link but this is a true story:
The Day the Host Dropped
The pre-Vatican II rubrics for when a Host is dropped, like the rubrics of the Latin liturgy, safeguarded the reverence due to the Blessed Sacrament. The May 1949
American Ecclesiastical Review explained:
“This procedure requires that the spot on which the Sacred Host has fallen be purified, usually with a dampened purificator, and then scraped and the scrapings thrown into the sacrarium [small sink in sacristy that drains into ground under the church]. Authors, generally, in order to avoid delay in going on with the distribution of Holy Communion, interpret the fulfillment of the rubric to allow marking the spot on which the Sacred Host has fallen, either with a linen cloth or with the plate used with the cruets, the priest returning after Mass to purify the place in the manner prescribed in
De defectibus. ”
This strict procedure not only gives God the reverence that is His due, but profoundly impresses the spectator, as it impressed me at a young age.
The year was around 1965, I was a boy of about 7 years old. My father took me for Sunday Mass to the “Italian Parish”, Our Lady of Consolation in Philadelphia. The Mass was still in Latin, the sacred atmosphere still pervaded the church and the liturgy, though the first updrafts of change were in the wind.
During Communion time on this particular Sunday, the priest accidentally dropped a consecrated Host. We were sitting up front, and my father drew my attention to it.
The priest briefly interrupted the distribution of Communion to fetch a small white cloth which he placed over the Host on the floor. The distribution of Holy Communion resumed, with the priest and altar boy carefully stepping around the Veiled Guest.
My father purposely kept me after Mass so that I could see the purification rubric from the front pew.
All was done simply, quietly, for there was no talking in church whatsoever back then, in reverence to the Blessed Sacrament.
The priest and the altar boy approached the spot near the altar rail inside the sanctuary, the spot covered with a white cloth. The priest then dropped to his knees, lifted the veil, retrieved the Sacred Species and consumed it with dignity and decorum. Slowly, reverently, still on his knees, he then cleaned and purified the section of the floor where the Host had dropped.
He took his time. There was no rush. An air of solemnity, holiness and adoration pervaded his every move.
I was fascinated and edified by the procedure. I remember thinking to myself, “truly, the Sacred Host is the Body of Our Lord Jesus Christ,” because the priest tended to It with awe-inspiring care and reverence.
It was the best catechism lesson on the Real Presence I ever had.