Question

how does Gerrard convince the intruder that he too is a crook wanted by the police
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Answer 1

Answer:

When Gerrard indicates the door that leads straight to the garage, the Intruder walks into a trap. Hence, the bag played an important role in convincing the Intruder that Gerrard, too, was a criminal like him and was preparing to flee when he broke into his cottage.

Answer 2

Answer:

When Gerrard came to know about the Intruder’s plan, he kept his cool. He cooked a story to outwit him. He said he is also a murderer who was in hiding and that is why he was a mystery man who never met anyone including the tradespeople. So, if the Intruder took on his identify, he would not gain anything. He would anyway be accused of murder.