I am not sure if the question is about how Christ is present differently in the eucharist or what is the value of the eucharist.
According to the Catholic view, God is present in different ways. First, God is present everwhere, holding the universe in being. God is present in another way, by grace, which is given to souls. But Christ, though he gives grace to souls, is present in another way to those who have the eucharist. He is actually present, in his body and blood, though there is the appearance of bread and wine.
According to the Catholic view, the eucharist confers grace. If the Protestant you spoke with believes in baptism, you could mention that baptism itself confers grace–and the eucharist does too.
You could ask the person if Christ’s presence was the same in these two cases. When he was in this world, he was present in body and blood, so that you could speak to him and touch him. Now he is present by grace to Protestants like other Christians, but he is not present in physically.e actual question.
I hope this addresses th