I have seen the blue ones in second site of Jet Set hooligans escalation that did not escalate further, they spawned right beside their red brethren, they were some kind of elites. There were a lot of them there, third reinforcement wave. It all happened after warping past the gate and killing the Mad Cat frigate that had a lot of rep power. First time I have seen this composition of rats.
Now when I read Uni Wiki about those ships I see it was good decision to warp out.