He has it exactly backwards. The accidents of bread and wine in the Eucharist are literally the Body and Blood of Jesus through transubstantiation. I’m sure what he’s doing is buttering you up to try and hit you with more questions, so allow me to clarify a bit what transubstantiation and how St Thomas Aquinas explained it as working:
Let me give you a philosophy primer and then a metaphor…
***The primer:
***Reality is not defined by existence, but rather by essense. In the greek philosophy, let’s say simply that the idea of a man preceeds the existance of man… in other words, I am a man because I have the ESSENSE of a man, and incidently I have the body of a man to go with that essense… but my “maleness” existed before my body. This is contrary to existentialism that says I’m only a man because I have the body of a man. So to everyone before Neitsche and existentialism came around, reality was defined by the essense of something… THAT was reality, not just what you saw sitting before you.
**Metaphor (or, how this applies):
**Let’s say I have a clock. It has a wood housing, a face, gears, hands, etc. But the clock is a clock because it is a timekeeping piece. My clock could just as easily be made entirely from metal. It could be digital and have no gears. It is a clock because it’s ESSENSE says it is a timekeeping piece known as a clock.
One day my clock breaks. It will no longer tick or tell time (as I like to joke, it becomes accurate only twice a day). I start to set it on papers to keep them from blowing off of my desk. The clock no longer tells time, it now has the essense of a paperweight. It still has the wood, the gears, the hands, the face of a clock… but it does not have the very essense of a clock. This is no longer a clock, it is a paperweight in the physical appearance of a clock.
In the same way, we have the bread, but the institution of the Eucharist REMOVES the essense of bread from it’s physical existance. This essense, it’s real being, is replaced totally by the essense of Body of Christ. As such, it is Christ in the physical appearance of bread. The reality is the essense, that the real being of the bread, it’s essense, is now that of the Body of Christ.
(Side note: in church dialogue, these two natures of objects are known as substance and accident. So transubstantiation removes the substance (essense) and replaces it with new substance, while the physical accident (existence) is unchanged. This is not merely a spiritual change, however, remember we are talking pre-neitsche where essense is reality, not existence).
For a scriptural defense of the real presence, this site is excellent: scripturecatholic.com/the_eucharist.html