Network Web Prevent - F5(ICAP) - use for redirect

Using Symantec DLP Network Web Prevent, how can I utilize an AD group rule to kick off an  "if this global-group is detected" in this OWA data stream then return to Proxy (F5) some kind of command or header to tell it to send to a specific OWA server ; any other traffic from OWA  not matching that global group should follow standard data flow to another OWA serve?  Ideas?