i got this relatively easy in chapter 2. All you have to do is be running away from an enemy, the guy from chapter 2 seemed easiest for me, and just slide out of his reach. since i got this on chapter 2, i will be using that enemy as an example. I'm not positive, but i'm also pretty sure this counts across playthroughs, so if you attempt it multiple times and he catches you reloading and continuing to do it should work fine. This method really doesn't take more than a minute or 2 once you get the hang of the timing
When he is chasing after you he will typically stop for a fraction of a second and then try to grab you. if you are already running away from him, when he stops just before grabbing you you have a small window that you can run and slide and easily get out of his range.
I was also able to do this against the enemy in chapter 3, but only in the kitchen really, and i found it a little harder to manage.
EDIT: you can tell if it worked or not cuz you'll see the eye in the corner saying its saving. it saves every time you evade the enemy.