On those sounds being heard the down of Bhima’s body stood on end; and he began to range that plantain wood, in search of those sounds. And that one of mighty arms saw the monkey-chief in the plantain wood, on an elevated rocky base.

In plain words: Hearing strange sounds, Bhima felt the hair on his body stand on end. He searched the banana grove and saw the monkey chief, Hanuman, sitting on a high rock.