Board Thread:Questions and Answers/@comment-29253991-20160723202751/@comment-29236059-20160725185214

I think Pancry is true, because when you (presumably) see Gaster in the room (where he get's surprised or however he reacts), he can't be non-existant or dead when that happens because then you wouldn't see him. And the fact that he disappears would support the concept that he isn't alive, regardless that it's clear something fatal happened to Gaster in the past. He obviously isn't in any physical form, maybe to the eye at least. That is why I think he can watch everyone live on, because he can disappear (whether it be at will or not)