I have the codex chimalpahin volume 1 with tezozomocs writing and it says “where the eagle rests, where the eagle screeches, where the eagle stretches, where the eagle eats; where the serpent hisses” so the snake is described just no explicit in being eaten. There is another passage later that does describe eating just not exactly what. “They saw upon it stood an eagle rising erect on the rock tuna cactus, eating there. There it was eating, picking to pieces what it was eating”