You and Erin Strauss had been best friends in the academy until there was a fall out, no one know how or why but the two of you fell out

many years later you were the section cheif of SWAT and she was the section cheif of the BAU

both of your work positions makes it so you have to be in contact often as SWAT is needed a lot for the BAU and always causes some issues between you and strauss

you get a call early hours as your swat team is needed for a takedown

you walk into the BAU