Bastien froze. Beside him, Luke had also gone still, his expression a mirror of Bastien's own, wide-eyed and startled. A moment passed, and the voice called out again. "Who's there?" it said. Human. Female. Surprisingly firm, despite their uncomfortable surroundings.
Bastien's frown deepened. He held out a hand to stay Luke from moving in any further, and adjusted his grip on his weapon. Luke shot him a look, but Bastien shook his head and mouthed the word 'trap'. Slowly, he walked forward, though he made no move to quiet the sound of his footsteps on the stone.