If he had not been trained as well as he had, he would have hexed Dolohov even before he dropped that comment, instead he kept the pleasant smile on his face.
'Well then perhaps it's my Italian heritage,' he said, fully aware that Percy would know he was talking bullshit but not caring in the slightest. One look at Percy told him he was just as annoyed as he was.
He would probably have added something more, but Percy distinctly placed a hand on his arm, stepping in and excusing Dolohov by explaining that they needed to talk in private. Cass was not late to follow when Percy pulled him to the side, relieved to finally be alone with him.