The enemy. From Reuters:

MILAN - An Egyptian accused of helping plan the Madrid train bombings in 2004 indoctrinated young people in Spain and advocated martyrdom, an Italian investigator told a court on Friday....

Standing trial with Ahmed was his suspected protege, an Arab man named as Yahia.

Ahmed drew inspiration from Berg's beheading nearly two years ago, according to an audio recording by police.

"Together with Yahia, his disciple, he watched a video tape of Berg's execution and made comments referring to jihad and martyrdom," Megale said.