How to loop Raven (ideas for TAS improvement in description)
The hitbox is in front of him and if you keep doing that, he can't hit you because he will not spin fast enough to reach you. Could be used to skip Nikita entirely on Any%, but you would have to arrange your stuff because you need nades for Tower B and 12 nades won't be enough.
I'm not recommending this as the timing to throw and cook nades is VERY tight as they need to explode exactly when you're on the opposite side of the nade. Also, if the nade bounces you'll get damage from it no matter what.
However, this could be a very viable TAS-like strategy as you can use less Chaffs on Tower B and have enough nades to throw afterwards.