The blood of the covenant is the basis for this sacred meal. The Eucharist is an indispensable element of this triumphal coming. You cannot separate blood from wine.
We considered the shouts of the people of God in Zechariah. Yahweh had become their protector and victor. The true King gives his life/his blood for the sake of the people. Those who cried and sang expressed a theology of authority and submission. true authority is sacrificial. True submission can only occur by following the One who submitted himself, even to the point of spilling his own blood.
All this we celebrate at this table, where Jesus and His disciples eat and drink and sing. At this table, we celebrate the coming of the Lord, His victory, His judgment. At this table, we anticipate His coming again, to judge all things and bring in the new heaven and new earth in fullness. In this meal, we celebrate all that Jesus has done, and anticipate in faith all that He has yet to do.
 The third paragraph is taken from a Leithart meditation.