After that he appeared in another form unto two of them, as they walked, and went into the country.
All Commentaries on Mark 16:12 Go To Mark 16
Augustine of Hippo
AD 430
It seems as if some impediment to recognition had been effected in the eyes of those who beheld him; and when it is plainly said elsewhere: “He appeared to them in another shape”—obviously in his own body with another appearance—some effect was produced which acted as an impediment to prevent them, that is, their eyes were subjected to a delay in recognition. Letter , To Paulinus.