That means Dinner is ready. Do this attack mostly when the oppenent is already in the air or use the beacon bomb. Well he turns into sentinal size and hits your buddy a wham bamm bigalow. Press HP repeatiously. Combos are attacks made up and fast finger moving.
Infinites are combos that are endless until the person is dead.
Well here is the strategy. I'm recommending you to pick T. Bonne's Throw Type. I don't really care but pick hayato or strider. If you have a maxed out hyper bar press the two assist buttons at once. Get used to his hand movements.