here is a tip for all of those who either think this is hard or is bugged.
whenever starting the game, go immediately up to the top of the map for a body then go right.. when you see a red light, go left then cut a narrow wall where med bay is supposed to be. the imposter will get stuck up there. now go down, grab the body, then leave if the imposter shows up in the vent.
these r just helpful tips for starting the round, but you can actually manipulate the AI doing this further in the game.
there are several areas in the map that you can warp your character around a narrow thick wall that will make your opponent stuck. you can also find lots of corners that you can forcibly slow down the imposter with if you cut them.
these are just some tips, but let me know by replying below if you have any questions about these tips, or have any more questions for tips.