Guys, here's a new technique. I'm not sure if you've used it before. It can greatly reduce the difficulty of this boss battle, especially in hard mode. When fighting Grimm, you can grab its three tentacles separately, which will make it fall to the ground.

Here the URL:【

Yes，it works 100%

Dont know why.i guess it has more glitch to look for！

intresting to know

Another important thing, make sure to get rid of the Greene's tentacles on the ground or you'll give her extra tentacles (6+ & 12+!)​ which will make this technique less efficient.

Greene's tentacles will be cleared by the way, so it's not a matter of worrying, it's really about how to get close