 Carter later noted that the hardest part of " First Person Shooter " was casting a suitable actress for the part of Maitreya . Casting director Rick Millikan looked into every possible avenue — including strippers , porn stars , and erotic thriller / direct @-@ to @-@ video actresses — before settling upon Krista Allen for the role . Initially , there was a " wholesome quality " that bothered Carter , but as the episode was being filmed , both Carter and Millikan recognized that Allen was right for the part . In addition to the part of Maitreya , several stuntmen were needed for the episode , including doubles for Mulder and Maitreya for their martial art fight scene . Experienced gymnast Dana Heath was hired for several scenes that required Maitreya to execute a series of handstands . Fourteen stuntmen were needed to ride Kawasaki 600s and fire gas @-@ powered machine @-@ guns . 
