http://newtheologicalmovement.blogspot.com/2013/06/if-jesus-doesnt-die-how-is-mass.html
Reality, Sacrament, Reality and Sacrament.
Thereality is that invisible grace given by the sacrament. The sacrament is that visible sign which is used in the rite. And the reality and sacrament is an invisible reality which is yet a sign of something further
even though Jesus does not die upon the altar but remains living and glorified in the Holy Eucharist, the Mass is yet the very self-same sacrifice of the Cross.
The res of the Eucharist is twofold: the Real Presence of Christ and the Mystical Body of Christ which is the Church. Further, we may state that the reality of this sacrament is the grace given to the one who receives worthily.
The simple sign or outward sacrament, in the case of the Eucharist, is the visible bread and wine. These are a sign insofar as they are food which give nourishment and refreshment to the body. Thus also, the Body and Blood of Christ are spiritual nourishment for the soul.
Christ’s Presence is not merely a res, for it is a sacramentalpresence.
The Real Presence of Christ in the Eucharist is res et sacramentuminsofar as the glorified Body of Christ (under the visible sign of bread) and the glorified Blood of Christ (under the visible sign of wine) are the res et sacramentum of the Eucharist.
the body and blood, soul and divinity of Jesus are wholly present in each species and under each of their parts.
Upon the altar of the Mass, the glorified and living Body of Christ is sacramentally separated from the glorified and living Blood of Christ (in truth, they are united, as the whole Jesus is wholly present in each). They are sacramentally separated, insofar as the one is the sacrament of his Body and the other the sacrament of his Blood. Thus, under sacramental signification, we see the body and blood of Christ separated upon the altar.
separation of the two Eucharistic species is the sacrament of the Cross – the only time and place in which the body and blood of Christ were separated as the lance of Longinus pierced the expired Heart of our Savior to allow both blood and water to pour forth.
the body and blood of Christ were (in their proper and natural species) separated upon the altar of the Cross, so too they are (in their sacramental species) separated upon the altar of the Mass. This is why the Mass is a sacrifice, because it is a sacramental sacrifice.
The Mass is a sacramental sacrifice, not a physical and bloody sacrifice.
there is no multiplication of offerings or of deaths. Jesus died once and only once for all people, and this one death is made sacramentally present through the sacramental separation of the body and blood of Christ upon the altar.
Jesus present in the Blessed Sacrament is living, but his Presence is itself a sacrament of when he was dead.