“Aaron 'Hotch' Hotchner: One brutalizes the parents. This is the dominant one. Sadistic, remorseless, extremely volatile. Emily Prentiss: The other prefers a needle. His injections are consistent with an angel of death. He's more withdrawn, sensitive, and he has a warped sense of mercy.”Tagged: Sadism, Remorseless, Volatility, Angel of Death, Mercy