Scenario:

-you're woken up at 9-9:30 by neighbors fighting. They are very angry, with the male using a very loud, irate voice. You can't even really hear the female (at some point you have a dream that some man is abusing a woman and that you do something, but then you wake up more confused as to what is real or not).

-you're relieved when the fighting calms down after an hour or so.

-several hours later, you revoke your relief as the fighting starts back up again, accompanied by large thumping noises that shake your own apartment.

-You assume that one of them is either pissed enough to move OR to hurt the other person.

-You:

A) take action, calling the police or something?

B) pretend it will all be alright, even though you have no idea?

(I am in a foreign country and can't decipher loud, angry British. I have no idea what they were saying except for: "You were out until 3 in the fucking morning!" and I only got that because it was repeated something like 90 times in an excited Olympic announcer level voice.)