Here inside the building -
Matthew is still listening to Clara's screams, he got angry and shouted at once, "Stop this nuisance",
All of a sudden screams were stopped and Mathew then able to think about the building plan. It means the ghost surrounded by the building are disturbing him not to go further and find out the key. Finding that key is what threatens those ghosts, so adding aspirations to every step he was taking. But he continued to move forward without letting up as he had a strong will to find the cause for his friends mortality and also want to save their present friends.
He strongly knows that the key is playing a very important role in their life's and it became a mandatory for them to wear it on their necks, otherwise it may be a danger to their life's. But he did not
