Board Thread:General Discussion/@comment-25071941-20200619024837/@comment-38952966-20200619200335

BtD is an actual entity that seems to have to actually travel into someone's eye, but you're partially right. I don't think the Stand itself can be damaged, and not even Star Platinum was fast enough to hit it before it reached his eye. That's why Diavolo would absolutely have to use Epitaph in order to get the timing just right. If he doesn't think to use Epitaph, he's screwed.

BtD is still bound to its host, so if Diavolo moves away from it in erased time there's no way it could catch up to him. I don't think a tiny Killer Queen would be floating in the air, but it definitely couldn't stay inside Diavolo's eye.

Still, if defeating Kira is Diavolo's goal, I fail to see why he would engage with BtD at all. It's more likely he would tail BtD's host until he found Kira and then take care of him there.