Talk:Fredbear vs sans/@comment-26523805-20170502173949/@comment-26814804-20170709223438

Also, the multi-hit is NOT KR. The bones that hit you in your menu boxes don't inflict KR damage, but they also don't provide MERCY Invincibility.

It's actually called that, by the way, mercy invincibility. I feel that it's strongly implied that Sans' lack of INV frames is because he doesn't have any MERCY left, which is also why Papyrus and TORIEL give you so many INV frames and UtU gives you so ungodly few.