At around 1:15:05 of the movie Therese (based on the life of St. Thérèse of Lisieux, late XIX century), we can see the host being dropped and then put in a piece of cloth and taken away. This seems consistent with the (modern) guidelines given in the General Instruction of the Roman Missal (GIRM):
- If a host or any particle should fall, it is to be picked up reverently.
What is unclear however is what is done to the host. This contrasts with the case of the wine, where the instruction is clear. These words immediately follow those above:
If any of the Precious Blood is spilled, the area where the spill occurred should be washed with water, and this water should then be poured into the sacrarium in the sacristy.
The GIRM does not seem to provide any direct guidance regarding the fallen host. Is it purified somewhere and eaten?