The bottom line is the minimum condition or limit that must be adhered to. Everything in the world has a bottom line. Crossing the bottom line means qualitative change. If you don't pay attention to the bottom line, you're driving yourself into a desperate situation.
According to the above definition, which of the following situations is crossing the bottom line?
Police Xiao Liu caught the suspect in the case. The suspect gave him ten thousand yuan, and Liu went away suspect.