The memory that gets absorbed is one of the ... okay there's not really a memory of Hakkai's that's good exactly. So we'll go with one that's just violent instead of super extra traumatic.

It's Hakkai, just covered in blood, holding a knife, and stabbing his way through bodies. It's like a war, except only one guy is fighting. That guy is Hakkai. The guys he's fighting all have long, pointed ears, fangs, and claws, too. In the memory, his face is utterly blank - he may as well be doing paperwork for all the expression he's got.

Sorry about that!