I wont be the first to point out the Eucharistic nature of Luke 24:13-35. Compare especially 24:30 with 22:19. Again the function is pedagogical rather than mystical. There is no need ask how Jesus is present at the meal, because he is literally present. Instead the Eucharist reveals to Cleopas and Co. that Jesus had been with them all along. The broken and blessed bread was a sign that pointed them towards the reality of Christ's presence. Jesus was only especially present in the breaking of the bread because the two disciples became aware of his presence. If Jesus is truly with us and has promised never to leave us what need is there for the elements of communion to be anything more than a sign that give us the grace to receive, believe and awaken to the reality of God-with-us in Christ?