I Am Not Sure Which Alternative is More Disturbing

Lawrence Wright's dense and definitive book The Looming Tower: Al Qaeda and the Road to 9/11 is full of disturbing stuff (and I'm only halfway through) but nothing comes close to this: after an assassination attempt on Egyptian President Hosni Mubarak's life,  Egyptian security forces made a concerted effort to rid Egypt of radical islamists, and to obtain information about Mohammad el-Zawahiri -- one of the leaders of the al-Jihad movement -- they captured Ahmed Sharraf, the thirteen year old son of Mohammed Sharraf (a high ranking al-Jihad member) and then they drugged the boy and sodomized him, and when he awoke they showed him photographs of his homosexual activity and threatened to show this to his father, if he did not cooperate . . . which, of course, he did -- and the security force did this to several children of radical Islamists in order to turn them into "boy spies," and while I obviously don't condone this fiendish but effective method, I am curious: did the sodomizer and the photographer take turns, or was one security agent always the sodomizer and the other always the photographer?