While Zhang Ming was planning the crew's itinerary, Ren He was also planning his own journey.
That night, after his close encounter with the police car, he plunged into the desert and managed to make his way through the wilderness to another national highway.
Mainly because Ren He didn't want to deal with the police at such a time. If he were to be stopped for a routine check, it would be really troublesome as he wouldn't be able to explain many things clearly.
Plus, there were numerous checkpoints on his return to the mainland, and Ren He wasn't sure he could safely bring those items back. However, he had spent a lot of money on them, and it would be too troubling to send them back unused.
The gun was almost identical to the one he had used in New York, and he had an attachment to it. Keeping it as his collection was also a very good choice.
The key issue was how to transport these guns back. If the police found them, wouldn't they call in the armed police to surround him?