There are still more mysteries hidden in this breaking of the body of Christ. The greatest is likely to be that it is not only His body that is torn.
When we tear the bread, we show the sufferings of Christ for His own. But the bread is also a symbol of us, His body, the church.
1 Cor 10:17
For we being many are one bread, and one body: for we are all partakers of that one bread.
And so, when we tear the bread, we equally symbolize our sufferings at the hands of His enemies and ours. There was a cup of suffering for the Lord Jesus, and there is a cup of suffering for us. The Lord refrained from allowing anyone to share in His cup, but there is a very real sense in which Christ's sufferings were not enough - there are sufferings yet to be paid, and we are privileged to join our Lord in those deep waters.
Who now rejoice in my sufferings for you, and fill up that which is behind of the afflictions of Christ in my flesh for his body's sake, which is the church:
That I may know him, and the power of his resurrection, and the fellowship of his sufferings, being made conformable unto his death;
So in our time of communion with the Lord and with the saints, we worship and declare the sufferings of the Lord, but we also declare our intent to join Him at the cross. We commune with His sufferings for us, but we also commune with Him as fellow sufferers.
1) We declare His death until He comes
2) We embrace the breaking of His body for us.
3) We declare our willingness to join Him in suffering.