The sound of crackling twigs beneath his shoes snapped him back to the present.
He was unprepared for the fog that seemed to have thickened all of a sudden. Mark nearly lost his footing.
The floor of the woods was now uneven with thick, protruding tree roots that lay hidden beneath the layer of slippery leaves and twigs. He must have ventured into the deeper part of woods.
Mark began to feel uneasy.