So basically this method make you invulnerable to Witches by standing behind and really close to her, combine with "fast melee trick" to finish her off faster in case you have two-handed melee on you.
You could actually dodge her attack from around 2-3 slashes, if you're lucky and stand still you can dodge around 5-6 slashes from her (maximum) .

So few things you wanna prepare :
- Your luck.
- Prepare any melee weapons, but please be careful the attack speed of two-handed melee weapons ( Fire axe, Bat, etc..) they're really slow and you absolutely cannot crown the witches fast enough with them, by that you could learn how to use melee faster from this video link
https://youtu.be/aXc1XeWuCuM


Note:
- Chainsaw is not recommended in Realism.
- All melee weapons have the same melee damage on witch in every mode (4 hits), (Chainsaw is an exception).
- Do not move while jumping, that's just gonna get you killed.
- Notice what kind of terrain is your witch sitting on, killing a witch on flat ground could always be guarantee kill, bumpy surface/road is dangerous enough so i would recommend try to ignore the witch.
- Overall this method only work 90% all of time, this game have a several bullsh*t RNG mechanical that could always mess you up.
- Do not perform witch melee if she's not looking at you, which means if somebody walks up in front of the witch first, the witch will always stare at that guy, and you're the second person come up behind and do this trick, you most likely to get kill because she's not gonna stand still for you to crown her.






Here is how you do it:

Step 1 - Go BEHIND the witch ( IMPORTANT!! )

Step 2 - Hit, jump in the same time and keep going.

Step 3 - Don't stop jumping yet! (or you don't really have to, you only need to jump one or twice to dodge her attack and by that time you should already have enough time to finish her off).






Bonus :



Chainsaw do works on Realism Expert.

Additional stuff people been asking about my key binds to do fast melee and kill witches, so i just bind scroll wheel as jump instead, and i don't use "Q" button ( previous weapon key bind ), i use the number key 1-2 to do fast melee.

Combo!!1!1!!: ( Jump + Hit ) ( Press 1 then 2 ) ( Jump + Hit ) ( Press 1 then 2) (Hit) ( Press 1 then 2 ) (Hit) ( Press 1 then 2) (Hit)