Kill the angel in the cell.
You jiggle and move about, alerting anyone watching to your presence. Stealthily, you sneak up behind a captive angel and slit his throat. You enter into combat with a captive angel. A captive angel is cut on the torso with your slash causing lethal damage. For vanquishing the angel while he was vulnerable, the Powers have granted thee a Mark. You have gained the Mark of Savagery! You gain 50 archon points! You gain 86 practices! A captive angel has been slain! Your blood freezes as you hear a captive angel's death cry. You receive 0 archon points. You have completed a part of quest #3308, 'The Vicious Rapscallion'! A captive angel vanishes with a clap of thunder!