This picture (right) by Caravaggio is of the moment the two disciples realise that Jesus was the one who was walking and talking to them. Notice the posture of the two disciples. The one on the right opens his arms wide in excitment at the dawning awareness of who the stranger was. His eyes appear to be moving from looking at the table to looking at Jesus. It is a moment of "in-between" where he has not just quite focused on the Lord. The disciple on the left is about to leap out of his chair. See the tension in his body, not an emotional but a physical tension. He is about to leap for joy. He is looking directly at Jesus, he is a split second ahead of the other disciple.
And then Jesus disappears. Where does he go? This is a Eucharistic scene. He is now in the bread. The mode of presence Jesus has left us, where he is truly with us, is in the sacrament of the Eucharist. This story tell of the joy we should have on realising Jesus is among us, of our call to evangelise. Caravaggio captures the moment perfectly. It is a moment we should all experience as we grow more and more to understand Easter and the Eucharist. Jesus is with us, as real and as vital as he was to the two disciples. He is in what appears to be bread and wine, he has just this moment disappeared from our sight!