[Eustace has also picked on the sound, his ears straightening just a fraction. He glances back at Keith, already assuming his familiar must have picked up on it (a familiar, we must add, he'll definitely want to get to know better when not on a job). Just in case, he gives a subtle hand signal as they draw closer and he ducks behind the shadows of a structure on a roof, motioning for Keith to join him so they can look over and see what's going on.]
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