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There is a whole branch of linguistic science about metaphors. You do not have to have a particular direction from “left to right,” as it were, to set up a comparison that functions as a metaphor.

For example, if I say, “This is my little angel,” as I show you a picture of my granddaughter, this is what is called a gestural metaphor, taking a physical object and referencing it with the demonstrative pronoun “this.” Every ordinary user of English would know the picture is not my daughter, nor an angel per se. But they would know exactly what I intended to communicate about my daughter. Therefore metaphor. It’s automatic, unless it’s controversial.

Peace,

Mary, they were at Passover. The 'bread' was unleavened, because that is the bread used for the Passover Seder. He said the unleavened bread was His body sacrificed for them. If He had offered His actual body, in any form, to them to eat that night before His new covenant, He would have violated the very Laws against cannibalism He came to fulfill.

The disciples knew He was using the unleavened bread of Passover to show His death as the actual death prefigured in the Passover. The Passover lamb was slain, the blood was poured out upon the earth and a small portion was spread on the doorposts and lintel as a sign for the death Angel to pass over that home. The Levitical law was not violated by drinking some of the blood. That's Paganism.

Then inside the Home the sacrificed lamb was eaten, all of it, leaving nothing except what would be burned up to finish it. Had Jesus been offering His real flesh (which He had taught them but apparently not you was going to profit nothing in eating it) then He would have been fully consumed or burnt up in closing the Passover meal.

But Jesus had not yet been slain the night of the Passover Seder, so He would not have offered eating of the passover actual lamb slain from the foundation of the world because He was not yet slain. So what do you think He meant by 'this bread is my body to be sacrificed for you'? ... He and the disciples left the Passover meal and went to the Mt. He was not burnt up as the Passover actual sacrifice was commanded to be dealt with if there was any leftovers.