"Your spells are weak, predictable, old man!" he yelled angrily, easily fending off Moody's stunning spells and disarming spells without much effort while firing back his own choice disarming spells and hexes. He didn't make it as a Dark Wizard being caught of guard by something so simple, and he learned early on the types of spells he would be dealing with from aurors.
But it wasn't long before pieces of tree and ground were being blown up in all different places from their wild magic, making it even more challenging to see the battle obviously raging between the two of them. But he wasn't going to let Moody defeat him, not here, not ever. Especially when he had done nothing here to deserve it, in his opinion anyway. So Moody may have been in the right considering the time frame he came from, but Rabastan hadn't committed half the acts Moody was already holding over his head. And to him, that was some bullshit. "Is that it?" he egged on, not being able to help himself and knowing it would irk his opponent something fierce.