If you think Loki's haki is genuinely on that highest level (PK tier), then it shouldn't have taken him this entire time to actually defeat Harald. He would've done so prior to Harald coming back to his senses and letting it happen. I mean, Loki was clearly dominating the fight against a Harald who didn't defend himself against anyone (Goresei tactic) and just face tanked/regenned from it. 

**You don't think it's kinda dumb that we are arguing Loki has stronger haki than him if he literally couldn't kill Harald prior to Harald letting him?**

This kinda reminds me of the whole "Luffy beat Kaido because he had stronger haki" argument. When in reality, Luffy beat Kaido because of mainly his fruit ability (Bajrang Gun). If his haki was genuinely stronger than Kaido's, then he would've won prior to Bajrang Gun. I got a feeling Loki's fruit has something to do with his ability to kill Harald here. Otherwise, it would've happened prior if it had nothing to do with some type of devil fruit ability. It's not like Loki's haki just got 10x stronger in that short fight.

If Loki genuinely had haki superior to Harald, isn't it kinda odd that he needed Harald to allow him to kill him in order for him to do it? I mean, prior to this, Loki got all of his hits off on Harald. Not one of them did any lasting damage.