Once a great boxer , Tom Brown, went to a restaurant for dinner. He put his bag near the door, but he was afraid that someone 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 and he will be back in a few minutes." He put the paper on his bag and went to have his dinner. When he came back, his bag wasn't there. But he found a piece of paper on the ground. It said, "A great runner took away your bag, and will not be back." Tom Brown wrote the words on the paper because he   _  .
was a boxer thought the thief   would not steal his bag when he read the words. wanted to catch the thief wanted to get to know the runner.