Kong can only look on with a mixture of horror and astonishment as his rival disappears down the spikey kaiju's throat.
Anguirus knew what he was doing. No match for Godzilla, he waited until the self-styled "King of the monsters" was too weak to fight back and then wore him down even further before swallowing the most dangerous bit of his meal.
You might call him a coward. Cowardly or brave, he's the one with the Godzilla-shaped bulge.