I would say though, just logically, that he'd killed all of the other victims whilst they were lying down, so he would have been much more familiar with that technique and he never had any trouble killing the other victims whilst they were on the ground, so why would he have a job with Mary?
I can assure you that a large lamb of 40kg (to my 55-60 at the time) is difficult -see the beginning of the Ken Loach film, 'Raining Stones' if you want an illustration.
The method (if you don't have the stamina to run after it), is to trick it into an enclosed space and then immobilise it by getting it on the ground..
(I would sit on it !).

but it is more or less certain that all of JtR's victims were killed while they were lying down. If we read back over the inquest testimony and Bond's report, there is really no chance that they were killed whilst standing up. All of the doctors, except Blackwell agreed that all of the victims were killed whilst lying down. Blackwell just wasn't sure.
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