As sereph track the scent of three humans to the stairway he began fallowing them up when something burned his nose. Only one thing in training burned his nose like that, c-4 they rigged the staircase to blow. Most likely Incas they were overrun. He smirked they wouldn't do that unless they had a plan to escape or sir fighting. As he ascended the stairs after a few the scents split. Two in one direction one continued up most likely a sniper good they rarely carried heavy guns besides there riffle. As he continued up the stairs he eventually came to the door. He started the multi-plas rifle up wincing at the whining sound it made as it started cycling the plasma.