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Hello, i need some help to figure it out...please

Hallo! I’m previously, apologizing for my bad English, but im curious about one thing.
Situation: one guy create’s offer on sale (atomichub), another guy(of course it is bot) immediately buys it in same block.
Question: wha… how?? I can’t figure it out please, if anybody know’s answer this thread.
My suggestion is that bot listening node on pending transactions, and if found tasty transaction, immediately push buy-transaction…but… in same block? How it’s works?