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It is almost a reflexive response to someone who is wounded to pull the knife out - I remember a senior doctor who once did this even though logically he knew he shouldn't have. The patient died because the knife was preventing a catastrophic bleed. Once it was out the patient died before he could be moved to the operating theatre (even though it was one floor away).

Oh that's so sad :| Hopefully, I never have to see anyone with a knife in them.

Well if you do don't pull it out.