27
You draw your golden blade in time to deflect the bolt and send it screeching back down the staircase. It explodes among the reptilians, destroying them and their weapon, and scattering their burning remains all over the corridor beyond.
Feverishly you fight to free your trapped leg, cutting at the barbs with the tip of the sun-sword. Eventually you succeed, and limp down the stairs as fast as your injuries will allow.