This shows up again in 37.3. Burt seems clueless, but Riley says it was his. It was an affirmative, not a deduction and I cannot help but think she sounds a lot like Scratch with her "I can't!" I have said it before with little fanfare even before we learned of Angel's ring, a reocurring theme in this story is Fratricide and I think it continues in Season 4. Sure Riley cares for Angel, but this wanting to track Scratch down is pathological. Damn, Southern California is a big place and it is not like she can hire the Pinkertons in the Old West to track the bandits down.