For Michael Koubi, Yahya Sinwar has the eyes of a murderer. Few Israelis know the leader of Hamas in Gaza as well as Koubi, who, as an officer in Israel's internal security organization, Shin Bet, interrogated Sinwar for more than 150 hours when he was held in Israeli prisons. Sinwar is accused by Israel of masterminding the deadliest terror attack in Israeli history on Oct. 7 of this year when 1,200 Israelis were killed.