What happened after twenty mintues was beyond anybody's imagination.
There was a tremendous bursting sound and all the glass panes of four windows, including the closed one broke into pieces and fell down.
The bursting sound was so loud that everybody jumped in fright.
Henry and his friends couldn't understand the mystery.....
They kept wondering how the glass panes of all the four windows could break simultaneously with such a horrible ear - deafening sound.
Henry argued that if anybody wanted to do any harm diligently, he could break only one window glass at a time.
He said, ' It's a big mystery, I am completely at a loss to understand how it could happen'.
However, Mr Brown remained totally calm. He knew that they actually, came here to experience this mystery.
Everything was calm then. They dared not go out and investigate, as it was pitch dark outside. They remained in the room but kept discussing the incident.