Jori had a valid point when you looked at it closely. In a sense, Rain, too, was a wielder of dual weapons, though not in the conventional sense. His fists were his primary weapons, and in many ways, they were the best ones he could ask for. They were also extremely easy to use since they were part of his body, so he could attack whenever and wherever he wanted.
His hands were formidable tools, capable of delivering devastating punches and strikes. Over time, he had honed his hand-to-hand combat skills to a level that made his fists deadly weapons in their own right. With precision and speed, he could deliver a flurry of blows that few could withstand.
So, while he might not have carried swords or axes like some of their opponents, Rain's fists were a potent and reliable means of offense. One that Jori had dealt with a bunch of times.