There's a small huff, but it sounds like amusement. Approval, maybe. Sometimes you need to gain a sword's soul's approval before you can have it.

The vision disappears as instantaneously as it formed, and you are left standing where you were, sword in hand. It makes you feel strong.

You've acquired Yamato and seem to inherently know how to use it. That is, a sense of how to go about fighting with a katana, and that it is made to cut through anything, even space, even a soul. There wasn't a way back, but you may have found one. Teleportation unlocked! You can go wherever you want in the heart now.