While Sam was getting ahold of Bobby, Dean was doing some research on a Laptop while looking at the files and checked in the areas they were killed.  Maybe see if they were around any building to pinpoint and check. Dean also decided to use the cities cameras to locate the two they ran into earlier and see where they were housed and see what they were doing within a close time-frame.  It was the best he could do but that way he could track them.  

"Well, from what you're telling me by description,  they don't sound familiar to me. If you had names, I might be able to ask the hunter network. Why are you idjits up to?" He asked, the sound of suspicion in his voice.