The biggest heist of Richter's career, it all went off without a 7hitch. Meticulously planned, perfectly timed, he breezed past the alarms and scored the prize - but at the last, he was betrayed. Broke and on the run, one day he would get even.
Xiao Ling was running security - the betrayer alerted her to Dirk and she set the guards on him. Xiao admired Dirk's skills, and bears no hard feelings.
Armitage saved Dirk from the bounty hunters, and recognising his innate goodness and need for redemption, recruited him to the team.
Carson healed Dirk to full strength - and therefore feels some responsibility for his future actions.
Kaine spirited Richter to safety during his convalescence.