Vol 5: Ch 316 - Brief Story of Mei and En
After that incident, Rei called the Building Security Personnel and telling them of what happened a while ago and she also instructs them not to call or even mention her name. The Securities arrives right away after her call and cleaning up the mess, they also got the gun from Rei and of course, they were all wearing gloves since Rei say so in order to avoid being question by the police officers.
After then, the security carries the lady and drops her off at the police station without explaining since they only present the gun to the police officers before leaving because as an ordinary Senian citizen of having a gun is the most solid evidence for disobeying their laws.