We all have things that are precious to us. Some of us have a ring or a pressed flower from a sweetheart. Then some of us have swords as large as a full-grown human.
Considering that "scaling" Ash'gor's sword would have been silly, it's the same size. Also, everyone in Azeroth has super-human strength anyways, so it works. Trust me.
Check out the full comic right here, and tune in next Tuesday morning for a new page. You can also see all the previous pages in the gallery below.