My neighbors had a fight and I called 911 — was that the right move?

July 7 |

Kairu asks:

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Photo by eflon. Used under Creative Commons license.
I had an unpleasant situation this weekend.

My apartment neighbors (a couple in their 20s) had a fight, complete with thuds, pained screams, and the woman screaming, "Let go of me! Stop!"

I called 911 since it seemed to be more than a lovers' quarrel. But since telling friends, some say I overstepped my boundaries and should have minded my own business.

I feel if I'd done nothing and the fight escalated to a crime scene I could never live with myself.

What would you do in this situation? How do you know when to intervene?