First, as a point of clarification: the EDACS you are referring to is neither Ulster's, Orange's, or Dutchess'. It belongs to New York Communications Company, who leases airtime to assorted public safety entities on it - Ulster Police being one of them.
Talkgroup 06-084 is Ulster PD's dispatch talkgroup. It is a group call talkgroup, meaning one radio to many radios. As pro92b points out above, Ulster Police's radios also allow users to make one radio to one radio calls. Your settings on your BCD996P2 allow you to monitor for such one-to-one transmissions and you captured one such call.