An unforgettable experience today

When it wasAt about 9 o`clock in the evening, my roommate received a call and was informed that one of my classmates disappeared. He left a tipnote about life and death. All of us were so worried and guessed there werewas something wrong with him and he might be in dangerous now. [dangerous => a danger to others]
Soon we all went out to look for him. Since our school was near the Qiantang river, some of us went to the side of the river. I had a bicycle, so I rode it along the river. There were no lights there and the river was really dark. I shouted his name but no one answered. After a long ride, I could still could not find him. Fortunately, when I was about to ride in the opposite direction, my roommate called me and told me he washad been found. I was about to cry when I heard this news. On the way I returnedback to my dormitory, I realized that the wind was really cold and the darkness was definitely horrible.
In fact, it was a misunderstanding. He was studying in the self-study room and the tipnote was just nothing. He just wrote down some words from the web. Anyway, he is safe now and itthat is the best news.