How does malcom describe Cawdors exucution

Malcolm says that he talked with someone who witnessed Cawdor's execution. Malcolm adds that dying is the best thing Cawdor ever did because he threw away his loyalty to the king.

He never did anything in his whole life that looked as good as the way he died. He died like someone who had practiced how to toss away his most cherished possession as if it were a worthless a piece of garbage.