Both are stated to be gone by 12:46 approximately Ben.
12:46 just isn't very "approximate". It's very precise. Schwartz estimated that he turned onto Berner Street at 12:45, which meant he would have arrived at the murder spot a few minutes later. If the killer then dispatched Stride quickly out of fear that Schwartz and/or Pipeman were running off in search of a policeman on beat, it would mean he killed her between 12:46 and 12:56, i.e. when Dr. Blackwell believed she died.
Best regards,
Ben
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