Would you step in as a good Samaritan?

https://youtu.be/N_IbudTtM5A
This shows a video from Turkey where a man stabbed his estranged wife to death after seeing her with another man and the bystanders simply stand there and watch. It's horrible to me to see that not a single person even thought about stepping in as the woman screamed as he mercilessly stabbed her until he was satisfied with what he did. Needless to say, she didn't make it out of this alive. If I'd seen that, I would've shot the man immediately rather than going hands on which yields an extremely slim chance of success compared to using my firearm (even the master level trainers in empty handed fighting will have, at the very most, a 20% chance of getting control of the knife before he stabs them multiple times). I certainly couldn't just watch a cold blooded, brutal murder happen like that as I'd be hearing her screams and cries, and seeing the knife go into her every day of my life and have her screams forever haunt me knowing I could've stopped him but didn't. I believe us men have a duty to protect the vulnerable and stop evil people like him because the world is full of good people, only a handful are evil and wicked, but all the wicked needs to prevail is for good men to stand by and do nothing when they attack, and this video is a prime example of exactly that. Would you step in as a good Samaritan if you saw something like this happening?
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Would you step in as a good Samaritan?
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