The problem with the skill is that, even if you use it from directly behind larger enemies, it teleports you to them at 0 so any frontal attacks they're doing will hit you. This isn't a problem with skills like Soul Tear because you collide with them and stop, but Flow: Hanpuri is essentially useless in PvE against bosses as a result. It's probably one of the better Maegu skills in PvP, however, so ideally any buffs to it would be PvE-exclusive.