Durable is one way to put it. Then again, Sebastian isn't exactly human, so it makes sense that a monster would be able to withstand the impact that would have killed everyone else. Kaeya can't tell if he should be more terrified or more in awe, but he settles for something in between the two, well-aware that this is always just going to toe the line when it comes to something as impressive and enigmatic as Sebastian is.

When Silco tries to pull away from him, he guides his hand away from the other man, keeping them close just in case the balance will be lost. He knows that he doesn't have much to worry about when Silco starts directing his anger towards the Sanctifier, because if he can be petty at a moment like this, then he's going to be more than alright. That allows him to leave Silco's side just so he can stand by Sebastian's prone form.

The blood should be worrisome, but he can't do anything about that. He's no healer. All he can offer is some support to get both Sebastian and Silco out of here.

"I've no idea how you managed to survive that, but... Do you think you can walk?" The question of the century. Regardless of the answer, he offers a hand that Sebastian can use to pull himself up. If the other can't manage that much, then that's when he'll crouch low to help him up instead.