So they knew what Reno was? Well that wouldn't be surprising if they had watched their group and overheard their conversations. Its not like Oner intended for it to be a secret either. Of course, they didn't know what he was in the beginning, as the man who first came from this organization assumed that Reno and Oner were two souls in a single body which wasn't entirely too far from the truth, but at the same time was also pretty far off as well. The thought of wanting to fight for fun, being raised to fight, or seeking fights to test ones might were all concepts that were foreign to both Reno and Oner. 

Serin had taught him Magic as both a pursuit of knowledge and as a way to be able to use it to help people. If anything, Oner and Reno knew why they fought. To protect others and the peace that they all deserve. To fight for fun though and to hurt others for enjoyment? That was a vile thought according to Oner, and even Reno knew that wasn't right. But its not like they could change someone just like that. They already realized that a long time ago. Oner didn't really think that the answer to Reno's question, of why this mysterious group was helping their own, but decided to just forgo mentioning this detail for now. If just Fighting was their reason for helping, then it was clear that Oner would get no more answers from them. 

But still, may have been why they lost that fight, because Reno and Oner's reason wasn't there since they weren't fighting for peace or to protect others. Sure they were fighting with Jake to help him and that could count as protecting someone else, but ultimately it was a fight of self defense, a fight that Oner and Reno both thought was unnecessary and pointless. It was why they held back, which was perhaps arrogant of them. Would they need to go all out next time? Would that help next time? They would need to be alot stronger though, and Reno and Oner both thought of someone who could give them more power than they had now. The problem was finding the time to talk with this person. 

Both halves of the Denizen knew that they would need to find the time though, and if they couldn't find it then they needed to make the time, and hopefully the rest of their Quest to gather the Signs would give them that time.