Ankyra Sound Pressure

He heard Ingram's call from where he was patrolling the beach along the edge of the island. The summons came from the sound, not from the bridge leading to the island, which immediately put the demon on edge. 

When he arrived, the keeper was with a woman he did not know. Tulok came to stand beside him, two-toned gaze moving from the stranger to the listener's guard. Why have you called for the speaker or the listener? he asked, his manner gruff and to the point as usual.