Broken essence monsters

I've noticed quite a few times that the monsters agro while still "frozen" in essence crystals. I didn't realize they're full activated and basically just locked in place?

In the video below you can see the sentinels wind up and slam me back to my hideout.

https://youtu.be/b0cXXVLaph8?si=d5nweXPerGkUe3B2