I thought it was showing that Goblin Slayer doesn't stay particularly attached to any given weapon. He simply uses what is best suited at the time. He got a lot of use out of the goblins' own weapons because they were suited to cave size fighting. The line about the blood had to do with their sense of smell. Coated in that much goblin blood, they would smell him coming...but that doesn't work with the other scene were he coats them both in blood and dirt. So whatever.
We should discuss how amazing the soundtrack is for this episode. Super evocative for all of the scenes and really driving the emotions home. Gives me chills listening to the priestess describe the outcome toward the end of the episode. The music is so perfectly suited.