Marine Eggs

So the onos devours a marine, but instead of digesting him, within a couple seconds drops him as an egg. Marine can then break out of said egg or have others break him out.
(Regenerating health, maybe lowering the marine's armor? Details!)

Simple, interesting, and oh so much more fun than stomp. Works well with gorge hydras or whips as a sort of drop off point, its like hungry hippos!