I would rather return to the original theme, though someone's catchphrase is just provocative against Biblical Truth.
I was and am quite sure that Nooobody who holds Transubstatiation could answer the basic questions about the Lord's Supper:
1) Medical Lab Test
What is left unchanged and what is changed substantially should be answered. If they say that the Substance is not changed, then they are admitting that they don't follow the Transubstantiation, but they also accept them by Faith, which is the fundamental point of Memorialism.
If they still insist that the Substances of the Bread and Wine are changed to the Human Flesh and Human Blood, then they must prove it, which could never be done so far.
If they claim none of the above, they may be claiming either Illusion, or Delusion, or Deception. Please prove it!
2) Biblical Trespassing.
If they drink Blood, it is a violation of the Law given by God in Genesis 9:4, Lev 17:10-14, Deut 12:16, 15:23
They are confessing that they are ignorant about the Law of God and they are cut off from the people of God.
None of the ECF's exegeses could be presented on this question. None of the Catholic sites provides the explanation on this issue, as far as I know. Therefore, RCC who are usually bringing the ready-made Catholic interpretation like parrots, rather than their own thinking and interpretation, cannot find the answer to this question again.
If they are honest, they must try to answer to this.
Was Jesus violating the Law when He gave the cup? Did He indeed distribute the human Blood to the disciples to drink?
3) Ignorance of the Bible
The Blood was to be offered to God, not to the human beings to eat. This is the fundamental Tru!th, for which Jesus came to this world. But RCC doesn't know this truth! How miserably foolish they are!
The whole Redemption Truth is based on this Truth and Jesus offered Himself at the Cross by shedding the precious Blood there, based on this Truth!
Did disciples suck the Blood shed at the Cross?
As for John 6:63, RCC made some childish interpretation on it., but don't understand why the Jews left Jesus.
The Jews came to Jesus to get some physical food like Manna after eating miraculous food from 5 barley loaves and 2 fishes.
They still pursued the physical food to eat.
So they said this:
John 6:
31 Our fathers did eat manna in the desert; as it is written, He gave them bread from heaven to eat.
Then Jesus said
40 And this is the will of him that sent me, that every one which seeth the Son, and believeth on him, may have everlasting life: and I will raise him up at the last day
47 Verily, verily, I say unto you, He that believeth on me hath everlasting life.
63 It is the spirit that quickeneth; the flesh profiteth nothing: the words that I speak unto you, they are spirit, and they are life
Then the Jews were disappointed and departed from Jesus
66 From that time many of his disciples went back, and walked no more with him.
RC people are confessing that they are the descendants of those Jews who pursued the physical food instead of Words of God, then were disappointed with Jesus and departed from Him.
The Words of God are the real food for the life of the believers, which is not understood by many natural or carnal churchmen ( 1 Cor 2:14, 3:1, 3:3)