Theophylact of Ohrid

For having now obtained a spiritual body, distance of place is no obstacle to His being present to whom He wished, nor did He any further govern His body by natural laws, but spiritually and supernaturally. Hence as Mark says, He appeared to them in a different form, in which they were not permitted to know Him; for it follows, And their eyes were holden that they should not know him; in order truly that they may reveal their entirely doubtful conceptions, and uncovering their wound may receive a cure; and that they might know that …

Catena Aurea by Aquinas ↗

Bede

And it happened that while they were conversing and questioning, Jesus himself, approaching, walked with them. The Lord, approaching, accompanied them while they were speaking of him, so that he might both kindle their faith in his resurrection in their minds and always fulfill what he had promised by the hidden presence of his majesty. For where two or three are gathered in my name, there (he says) I am in the midst of them.

On the Gospel of Luke ↗

Bonaventure

Thirdly, regarding Christ's gracious companionship, he adds: And it came to pass, while they talked and questioned among themselves, that Jesus himself, drawing near, went with them. They are said to talk in their speaking, because they were speaking words that did not have certainty, so that they could truly say that word of Sirach 43: "We shall say much, and yet shall want words; but the consummation of our words is he himself." And because they were in harmony in their going and were speaking about the good, therefore they were …

Commentary on Luke, Chapter 24 ↗