@BowserofPower The Plumber would grunt, turn around and punch the Koopa right in the stomach, afterwards he'd perform an uppercut, similar to Mario's up tilt.
@BowserofPower As the plumber hit the tree, he'd groan in pain. He'd get up, dusting himself off. With a hug, he'd fire a few fireballs at the other, hoping it'd hit. Whilst doing this, he'd charge at the spiky shelled creature, preparing for a drop kick.
@BowserofPower Nod nod. "Alrighty!" With a grin, he'd throw a punch towards the other his familiar foe in an unfamiliar body. He'd hope his unfortunate situation wouldn't hold him back. Whilst punching, he'd ready himself for what could be a heated battle.