Should Men Strive to physically intervene in situations of violence?

I am a 25 year old guy. I work out regularly and I am in decent shape, though I am on the shorter side at 5 foot 8. I have no fighting experience or training.

Yesterday, as I was leaving my office and walking through the parking garage, I passed by an elevator just as the doors were closing. In that split second, I saw a man violently slam a woman to the floor. I was shocked. He was much bigger than me, at least eight inches taller and probably over fifty pounds heavier.

I froze for a moment but immediately called 911 and gave them the exact location. There was no one else around and I did not know either of them. I stayed nearby and waited until the police arrived about ten minutes later. I watched them arrest the man.

Now I keep replaying it in my head. I feel like I should have done more. Should I have physically stepped in? Could I have used something I had on me, like a heavy metal water bottle, to stop him? What would have happened legally if I had hit him? I keep thinking that if it had been someone I loved in that elevator, I would not have hesitated. But I also know I could have gotten hurt or made it worse.

I feel guilty and a little ashamed. I do not know if I did the right thing. I am just looking for honest thoughts from people who might understand.