I send the Dancing Lights ahead.

You close your eyes and concentrate on your magical capability within yourself, and feel rather than see the four glowing orbs drift down the new corridor open before you. 

Instantly, the regimented marching STOPS. Your eyes shoot open as you hear the sound of gears ticktickticking into place. Then silence. You breathe a sigh of relief, take one step forward, and---

you halt, your leg still in the air, at a metallic ding!

 ---Then the silence in the chamber is annihilated by a chorus of metallic voices screeching "INCANTATION DETECTED! INCANTATION DETECTED! CAPTURE THE INVADER!" The metallic footfalls become a cacophony as the somethings in the next room chase after your light. 

What do you do?