The Citadel of Chaos

The old man's strength begins to return as the Stamina Spell takes effect.
He tells you he was beaten about the head by cruel Ganjees, who delight in thuggery.
You bring the conversation round to the Citadel itself.
Suddenly, for no apparent reason, a stab of pain from within grips him.
His eyes narrow to slits and he throws himself forward,
sinking his teeth – sharp teeth at that — into your arm.

Will you beat him off with your sword,

or use a Magic Spell to free yourself ?