..An injury to Sean Pierson had opened up the door for former UFC fighter Quinn Mulhern to make his UFC debut. According to Mulhern on Twitter today, he’ll be taking on Rick Story at UFC 158, which takes place March 16 in Montreal, Quebec, Canada. Mulhern is the latest Strikeforce fighter to cross over to the UFC, and after seeing his fellow Strikeforce alum go 3-0 at UFC 156, there’s no doubt he’ll be motivated to pick up a big win over Story, who needs a W desperately himself.