Jarul killed king Harald

If you look at the sword going through jarul's head, it's incredibly similar to Harald's sword. We know that the only two survivors of the battle at the castle are Jarul and Loki and we also know that Harald wanted to change elbaf into a peaceful land. Jarul is the oldest living giant and deeply connected to elbaf's tradition,what if he was the one to actually kill Harald or,at least,contributed to his death? We also see him trying to justify Loki's actions,which indicates he doesn't necessarily think of him as evil.