verb/benˌθeɾlo en su ˌpɾopjo ˈxweɡo/
to beat someone at their own game
“[…] que pudimos darle su merecido y vencerlo en su propio juego... el juego de la violencia y la muerte.” — […] that we were able to give him what he deserved and beat him at his own game... the game of violence and death.
Literally, “to defeat him in his own game”.