One thing that is weird about the shirt pieces - they had been cut out quite neatly in a rectangular shape..does this actually imply that Z was not in a stressed situation? After having shot Stine into his head only seconds before? Tough...
Another point - Stine, imo, wasn't chosen accidentially, at least not in his role as a cab driver. Z did take some pair of scissors (or comparable) with him to cut those shirt pieces out, those later to be sent to the newspaper. Would anybody do that with e.g. a dead body lying on the street? Rather not, as people could immediately pass by on the street after hearing a shot. This better (~) had happened inside a cab. The crime, using such scissors, had definitely been prepared in advance, comparable to LB where Z had avoided his face to be seen before approaching his victims.
What shocks me most is the way Z had taken his time to wipe the cab, cut the shirt pieces.
1.) The crime HAD to be prepared, it did not happen accidentially.
2.) The crime, imo, was not supposed to happen on the street as passerbys could have disturbed his procedure of cutting out the shirt.
3.) Therefore Z had known that the crime will happen inside e.g. a cab.
4.) Even more, Z was aware that he will take this 'trophy' , he had already known that he will later send a piece of shirt by letter.
5.) And he did not cut it in a hurry but rather controlled, in a rectangular way (fitting into e.g. an envelope).
6.) He therefore was aware of about how the shape of the shirt should look like.
One more thing is weird...the position of Stine - the shirt pieces had been cut out from the back of his shirt, which is actually where Stine finally was lying on. So Z really must have moved the body of Stine after cutting out the pieces.
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