Jon,
The stabbing is suggested as having been done in a frenzy,quick thrust and withdrawl.It is the withdrawing that presents the problem,and the problem is the sternum,not the heart.or any other part.As the blade has already pierced the sternum,there is an exit passage.However the solid part that is the sternum will still,to a certain extent,grip the blade.This requires more leverage than withdrawing through flesh,so a see-sawing motion will help,aided by the lubrication of blood and body fluid.It is the see-saw motion,in conjunction with the withdrawl motion,that extracts the blade.A larger wound is obviously made,but unless the blade is twisted,the outside skin will show a wider,but similar shape to the blade,and that is the difference in wounds that would have been noted.Can't put it simpler than that.
The stabbing is suggested as having been done in a frenzy,quick thrust and withdrawl.It is the withdrawing that presents the problem,and the problem is the sternum,not the heart.or any other part.As the blade has already pierced the sternum,there is an exit passage.However the solid part that is the sternum will still,to a certain extent,grip the blade.This requires more leverage than withdrawing through flesh,so a see-sawing motion will help,aided by the lubrication of blood and body fluid.It is the see-saw motion,in conjunction with the withdrawl motion,that extracts the blade.A larger wound is obviously made,but unless the blade is twisted,the outside skin will show a wider,but similar shape to the blade,and that is the difference in wounds that would have been noted.Can't put it simpler than that.
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