I just arrived back home after getting my mail and responding to the screams of a fellow apartment dweller.  I tried to gather help as I headed to the apt. of the woman who ran out two or three times screaming for help.  Her 59 year old boyfriend of 16+ years was unconscious in a chair.  I got him to the floor.  But, I was unsure really, at that time, what to do, but I knew I had to make an effort.  I took one course in CPR, got my wallet card stating that I am certified (does that really mean more than taking a course?), and I was not doing all that I could.  I didn’t freeze...just was hesitant, resistant, scrambled for more help, trying to communicate with 911 (I could not get a dial-tone with the resident’s cordless phone!)  The woman called 911 on her cell and I took it from her since I spoke clear English when she didn’t.  (When a Police officer heard that I used the cell phone, he sighed because cellphone calls to 911 in the SF Bay Area are routed to the California Highway Patrol in the East Bay and not to a local 911 call center.  I knew this but forgot to mention the city I was in...this is why the 911 operator kept asking the building number over and over, and I repeated it, over and over.  Prior to using the woman’s cell phone, I had problems operating my iPhone!  
Damn, I could have done more!

UPDATE:  24 hours later, I can reflect and say that if I get into a similar situation, I will try to be a bit more organized in the initial steps.  It was all in the training.  I keep reflecting on what happened, and I think about how our troops are trained, and then what they do when they first confront an enemy attack.  One big difference, there are others around them to assist in the situation!