Plot hole
When patient zero first started attacking, he turned into the doctor and the doctor got killed, then the lt. got killed by the other lt. why didn't he just kill him there were only two of them left in the room, its like *beep* I just killed the 2 wrong ones and the last one left is the right one but hell I won't kill him, just in case the 2 first ones maybe were the right ones, besides all the evidence pointing otherwise, if it was me I would have simply shot both doctors in the begging sort them out later.
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