Trel has been a consultant with several vargr rebel groups on Qarrz. To them JC Quinn was known as "The Butcher of Qarrz", who effectively crippled the rebellion on that planet for a time. He only knows of Quinn by reputation (which he takes with a grain of salt, war being what it is, and vargr being what they are), as he hadn't arrived on Qaarz by the time Quinn had been promoted offworld, but he won't necessarily be overjoyed to see Quinn when he sees him on the bridge.