That he had known. He couldn't entirely blame them, though in the end there had been some bitterness, irrational or not. He had... cared for Asgore deeply. Seeing him killed where the scientist had been helpless to step in and intervene had been a pain he'd slowly become all too sadly familiar with.

His sons.

The queen.

The king.

Dead, alive, dead again, RESET after RESET-

How strange. Helpfully, he did sign the word DEER for them, filling in the space in their sign language.

I hope I may meet them.