I went through this...I lived on the bottom apartment, and they were above...they stayed beefing. One night it got physical. He suplexed her ass, and the ceiling shook....I just sat up in my bed, cause I knew what was next...5 seconds later, she was knocking at my door....my babies had woke up and came out in the living room...I opened the door, and there she was. She had a fat lip, a knot on her forehead, and she was grabbing her back. I let her in, and she just sat down on the floor, crying her eyes out. She was on some "I can't take this shit no more" ish. I asked her what did she want to do, and she said call the police. I asked her "Are you sure? Cause if we call, and you go back...ain't no point in you calling at all." She sat there for a minute thinking.
He comes down stairs banging on my door. So, I went and got my piece, and answered the door. He was like "Tell that stupid bitch to come back upstairs!!!" I told him to take his faggot ass back up them stairs, and don't fuck with my family. He stood there and gritted on me, and I flashed. He stood back, looked at her, and was like "Get the fuck up them stairs, NOW." She got her ass up, and followed orders. I just stood there...I couldn't do shit.
The next day, she comes outside with her glasses on, and he gets in the car like ain't shit happen the night before. I stopped speaking to her, and just chalked it up.
Would I answer the door? Sure...but I would really consider how much help I want to offer.