Wow! It is really cut and dried with some of you guys. I'm thinking it would probably go more like this ---
Step 1: Call 911.
Step 2: Get on Monster.com and look for a job in another city.
Step 3: Argue with spouse over why we still live in a city full of tire-iron weilding thugs.
Step 4: Go to careerbuilder.com, computerjobs.com, etc., and look for a job in another city.
Step 5: Dig out lease and see if there is a "tire iron weilding thugs" clause.
Step 6: Look out the window. See if we can record action on video.
Step 7: Call 911 again.
Step 8: Call 401K company and see if I even have $7500 in their to retain a good defense attorney.
Step 9: Get gun and load it.
Step 10: Argue with spouse about whether I should take on a pack of "tire iron weilding thugs."
Step 11: See if TruTV will pay for video of "tire iron weilding thugs."
Step 12: Call the courtesy officer and the rental office.
Step 13: Call 911 again.
Step 14: Go to apartmentratings.com and post about violence in the community.
Step 15: Check FireArmsTalk.com and see if a 9mm is good for taking out "tire iron weilding thugs."
Step 16: Open window and listen for sirens.
Step 17: Take gun and walk dog to see if that dude is still getting beat.
Step 18: Verify nationality of beat-down dude.
Step 19: If H1B visitor, illegal alien, or pedophile return home, close blinds.
Step 20: If actually pretty blonde woman getting beat, come home and give gun to wife so she can decide to help her out and I don't get in trouble for paying attention to pretty blondes.
Step 21: Aim gun at thugs and tell them to stop.
Step 22: Shoot tire irons out of their hands with SW9VE. (It's easy if you have good trigger control.)
Step 23: Talk to police.
Step 24: Find out that I'm gonna get sued or arrested.
Step 25: Take last damn dime out of 401K for lawyer.
Step 26: Move in with inlaws.
Step 27: Find out that I hired a bad lawyer.
Step 28: Go to jail.
Step 29: Go to prison.
Step 30: Learn to make a shank.
On a serious note: I'd intervene. Tire irons justify deadly force.