No personal experience with a trained dog straight out to kill me.
I definitely would not want to find out. I'd like to think I would stand a chance but probably not much if I didn't have a weapon or if the dog didn't have a collar or something for me to gain an advantage.
Had an 80lb malamute/chow/lab mix turn on me. She was very dog aggressive but a big baby with most people.
The time she turned on me, she was about to get after another dog and thankfully she was wearing her harness at the time but had just taken her off leash.
She was in attack mode, growling with teeth shown and neck hair stood up, about to go after this poor terrier mix.
The second I touched the back of her neck to grab the harness she turned on me.
It happened so damn quick I couldn't give exact details because I went into fight or flight myself. She nipped my arm and I grabbed the harness handle picked her up and body slammed her on her side. Before I knew I was on top of her, knee in her ribs and holding her head down in the dirt. Took a few head slams to the ground for her to snap out of it completely and submit.
Thankfully no stitches for me.
Had she actually gotten ahold of my forearm and if I didn't get her to submit I don't know how ugly it would have gotten.