During a containment breach in site 13, causing all hell, test subjects just running around, every door locked open by a giant omniscientic black fox, pretty much the whole security department dead, they do the unforgettable, over the intercom you hear: "MOBILE TASK FORCE SAMSON-19, DESIGNATED THE BLACK CROSS, HAS BEEN DEPLOYED, THIS IS A LAST HOPE, DO NOT SHUT ANY DOORS OR HIDE AWAY IN SAFE ROOMS, WE RECOMMEND RUNNING TO ANY EXITS IMMEDIATELY, ALL GATES HAVE BEEN AUTOMATICALLY OPENED"

You hear a bunch of metal doors screeching open, the mobile task force, covered in so much gear that if you were to drop a grenade, they wouldnt even notice, walk through the hallway you are in, they are permitted to kill any test subjects, however, you get to choose what role you are