I dont know why this happened, but when i used Susie's Hope action, both Kris and Susie could not die. Their health just kept going further and further into the negatives.
i got a simmilar bug tho i diddent have a problem with kris not being able to die but i never let their hp reach 0 so they may have also been invincible i commented about it and more details on what i belive caused it
