He explains why it is customary that the Matzot (unleavened bread) are always placed in concealment, on a matzo-plate or on some other covered thing. It is written, “And the people took their dough before it was leavened, their kneading-troughs being bound up in their clothes upon their shoulders.” The hint is in “bound up in their clothes.”
The thing is that on Passover, the Kelim were not yet properly corrected. This is why there is the matter of the count, to correct the Kelim. This is the meaning of her words, “I saw the image of a drop of a rose.” It means that on Passover night there was a miracle that although there could have been a grip, there still wasn’t, since it was covered and nothing was showing on the outside. And this is the intimation, “bound up in their clothes.”