The Angel sits at the head when the Apostles preach that in the beginning was the Word: he sits, as it were, at the feet, when it is said, The Word was made flesh. By the two Angels too we may understand the two testaments; both of which proclaim alike the incarnation, death, and resurrection of our Lord. The Old seems to sit at the head, the New at the feet.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: Hom. xxv. in Evang. c. 1, 14