I must've missed this thread before now... I've seen the show a couple times but I started teaching on Wed. nights & have missed several episodes.
As for hunting pigs with knives, I guess it can be done, though I'm sure there are more intelligent ways that are less risky to the "predator". In a survival situation, you
can't afford to sustain serious injury - especially not if its avoidable!
I don't think you are going to kill a wild boar by throwing a knife into it though - not unless you are very lucky. Now cutting its throat or stabbing the heart & lungs by going in under the armpit - that would be a little more likely.
As for spears; I would not try tying a knife to a stick to make one (unless they have a
spare hollow handle knife). Rather, I would use my knife to shape the point & then
fire harden my spears. This would make for a much more formidable & durable weapon then just a sharpened stick or a stick with a knife
tied to the end of it.
If I couldn't find a deadfall or suitable cliff to run the boar off of (safest way to kill it would be to let gravity do it for you), I would have my fellows form a skirmish line & chase the pig into an ambush. Then harass the animal with spears so that I could jump on him with the knife. ...Or kill it with the spears if that seemed to be working - I'd plan on it not working though...
Kinda reminds me of a Robert Heinlien novel - I think it was called Tunnel in the Sky - anyway, the main character is stranded at one point & has to hunt with his double edged knive named
Lady MacBeth. He hunts by throwing it from ambush. A very cool book to read for the knife loving youth that I was...
This may be off topic but does anyone else name their knives? I don't name all of mine but certain ones just cry out for it... For example, my Tai Pan dagger; she is definately a lady but she's also definately a warrior - I chose to name her after Joan of Arc & thus my Tai Pan dagger is called "The Maid".
Anyway, Lost is a pretty decent show IMHO

...And Kate is definately a sight for sore eyes!