Stone thrower
Continuing his travels with the group, Arthur started to participate more and more when beasts would appear. He was getting the hang of his strength so an incident like the first time wouldn't happen again. Part of the problem was the density of the rocks themselves that were from the planet. Of course, the material and density differed based on what one's planet was, so it would take him a while to get used to his strength when throwing them.
Now, he was no longer killing beast with a single hit with the stones, Travelers like these needed to get used to fighting in order to grow, it would be wrong of him to deal with the beast single handedly. Besides the group didn't seem like the type to do that. Even if Arthur told them he could defeat beasts like these with such ease, they wouldn't have wanted him to anyway.