On the second floor, who should I report from the window on the first floor along the wire?

You can report to the property and fire department.

In the residential area, it is found that there are acts that damage the personal safety of others, such as pulling wires privately, and the property company has the right to order the owners to correct them. If you don't care about property, you can complain to the fire department. Irregular wiring may lead to security risks.