Why did the longest day in Chang 'an pass on Lu San to kill Master Xu?

It is said that Lu San should be a ephemera, that is, an alliance with Longbo. He clearly knows that the stone grease is 300 barrels. He is a pawn that He Jian planted in Jing 'an Division. In addition to delivering the message, he will eventually help Long Bo and his gang destroy the evidence and take a crucial step. So he can't be wrong. He didn't want to hurt Bin Xu, but Bin Xu had decided that he was the mole. "If you are kind, you must repay your debts" is the usual sentence pattern of the jackal. Xu Bin has long been suspicious. However, this actor's performance is almost dull and impersonal. Since he is a person who "bites the hand that feeds him", how can he be so decisive in dealing with someone who has been very kind to himself? His expression was nothing but cruel, tangled and ashamed.

Because Master Xu found out that he was undercover.

Xu Bin found that the customs manifest had been tampered with, so he decided that there was a mole in Jing 'an Company. When he found that Tong San was holding a piece of paper with handwriting in his hand and wanted to leave in a panic, he went forward to ask. As a result, Lu San didn't cheat anyone to kill him.

Maybe a lot of people are stupid to watch Xu Bin. How can he go there alone? Isn't this death?

But I think Xu Bin's reaction is normal thinking, because he doesn't believe that his colleagues around him will harm him. He is a bookish man, and will not intrigue with the people around him at all, because his kindness has caused a tragic ending.

At first, Bing Xu just suspected that there was something wrong with Lu San. At that time, Bing Xu was isolated and had to be more cautious, because Master Xu found out that he was undercover.