What is interesting about the line "ingentes Rutulae spectabit caedis acervos"? (Virgil Aeneid Book X, line 245)

This line is translated as 'will behold huge mounds of slaughtered Rutulians'. It is interesting as it is a silver line and an example of chiasmus. The words 'ingentes (huge).....acervos (mounds)' frame the sentence, mirroring how the bodies will pile up on either side of the battle field.