When Professor Knight testified during the trial, he said that Sheila could have moved
around for up to half an hour after recieving the non fatal shot - he did not take into account Sheila had collapsed and regained consciousness, otherwise she could have moved around over a much greater period.All in all consistent with Sheila being originally shot and found downstairs, rendered temporarily unconscoius, able to recover at a time when any blood from the original bullet wound had dried and coagulated. There would not be any blood running down her neck, or down her body if the blood from the original non fatal wound had already dried...