英语主观性阅读Once a great boxer, Tom Brown, went to a restaurant f

英语主观性阅读
Once a great boxer, Tom Brown, went to a restaurant for dinner. He put his bag near the door, but he was afraid that somebody would take it away. So he got out a pen and a piece of paper and wrote on it "The great boxer, Tom Brown, left his bag here. He will come back in a few minutes." He put the paper on his bag and went to have his dinner. When he came back, his bag was not there, but he found a piece of paper on the ground. It said "A great runner took away your bag, and he will not come back ."
问题：
Mr.Brown wrote the words on the paper because he thought____________.
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