The sound put Ruark on edge, he slowly and as silently as possible put down the whetstone. He got up from his seated position and instead went down on one knee, to make himself as small as possible. And as quietly as possible he waited for the source of the sound to reveal itself.

Spoiler: OOC
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I'm not sure if the sound is coming from where the bandits would be arriving from, or from further inside the cave where my companions are.