Interrupted by a sound from nearby

As you rest back, content with your camp, you are startled by a sharp sound from outside the small clearing. A sound like hollow bamboo being shattered against a post, repeated over and over again. With the now dim light of the set sun, the glare of the fire makes it impossible to see much beyond a few feet into the dark woods around you. Furthermore, the dancing shadows of the fire's light are causing your mind to play tricks on you, as in the darkness it looks as if the silhouette of one of the many trees has risen slightly above the rest, and is shambling its way towards your clearing.

As the heavy snapping of limbs and branches seems to grow more near, you have to question whether or not it is a mere trick of the light. In a panic, you realize you'll have to think fast.