If we analyze the excerpt we can notices that this was a group of friends who have just arrived to a mountain, a very specific one called Mount Magnificent, this mountain Is described as really big one, when they arrived they “were speechless with amazement”, and When statement represented astonishment that they all felt, taking this into account When statement must start with an expression of amazement “Wow”.
This story line was about witches presence in Salem. When Betty was possessed by a demon, and she screamed and tried flying out of the window. The whole town witnessing this rather than just the teenage girls help spread the rumor faster and convinced the village of the presence of witches in the town. The gossips went farther and quicker than expected.