Say it
I think the one that is supposed to be Ghaster, it felt like you could do something but I left it at three tried because of the dialogue
Frisk
Ok...it woud be nice if we coud run to gaster and hit him with his own gaster blater >=)
I'm pretty sure you're supposed to die there, since hardmode doesn't progress any further than that (yet?????). Although, if you run to the left and go up and interact with the sink, you can wash your hands before you die.