There are leftover parts of the angel’s face by the trees with red color clinging on them. Unit One’s head comes in the shot, biting into it.
SE <<(OFF right)(eating sound)>>
SE <<ガッ>>
UrsusArctos: *Yui-sama*: "No more optic blasts for you, punk! Yo' eyeballs be mah munchies!" If the eyes are directly connected to the S2 organ, that'd explain why Sachiel, Israfel and Zeruel preferentially use optical blasts. (Although it makes about as much sense as trying to use a camera as a laser beam after hooking it up to a generator)