Q: Would it be ok for the main celebrant to hand over the holy water bucket to the deacon to sprinkle the choir in the loft because he cannot walk upstairs?
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A: A deacon could sprinkle in the loft, but the liturgy presumes that the celebrant does all the sprinkling. Another solution is not to sprinkle those in the loft. There’s no requirement that every single person be sprinkled.