It's just a counter attack Great Marlboro uses when that attack is used on him, it doesn't do anything other than normal damage. Using Delay Buster is actually a good strategy for defeating Marlboro's.
It's a "counter delay." Every time it happens, the character who is eaten gets pushed back a couple of turns.
Brian: "If I remember correctly, this is the Physics Department."
Chris: "That would explain all the gravity."