Board Thread:General Discussion/@comment-27581425-20170619123421/@comment-32352928-20170625162809

A good question. Asgore's presence within the Underground is one rife with confusion. Though we have the facts that he's indeed the guy who buys snails from Napstablook, and occasionally visits Undyne for tea (and cocoa) we don't have any hard evidence that he's ever gone past Waterfall. The Ruins are, after all, locked from the inside. If they COULD have opened it, they would have. The human very likely couldn't have been killed by Asgore in there.

There is a small possiiblity however, that the "Patience" human was the first human to ever be killed by Asgore's new War. After all, Toriel explained to have been with Asgore until he claimed at least "one" soul, for her line of "You should have ascended to the surface once you claimed even a single soul" to make any sense. If Asgore "did" kill that human first within the Ruins, then it would make sense for it to be closed off forevermore, and Asgore's wandering the Underground would still make canonical sense.