This is not a down on the post but a serious question.
So you have a perfectly functioning knife and use it to make a knife to do stuff with. Why wouldnt you just use the perfectly functioning knife to do the stuff with and in a survival situation can the reed knife be made without a functioning knife to make it?? I understand the making of it for the pure fact of making it but in a survival situation can it be done without the functioning knife to do so and if not what can be used to make it that wouldn't otherwise be used to do the job you want the reed knife for.
I have always been very interested in making stuff and relying on myself when it come to life so all the posts Observe has put up are of real value for those of us who regard these things as important to know.G'day Von Gruff
Definitely a good question there, but sometimes it pays to make a back up knife if for some unknown reason your good knife is lost (eg: falling into the river, or an old concealed mine, or even a curious monkey may take a liking to the shiny blade.
I have watched a TV Series 'Naked & Afraid) when a couple of naked people get thrown out in the wild for a few weeks, they only get given a video camera each, and one item of their choice. The item usually being a fire lighter, or a knife. In this case, if you have a treasured blade and your partner decides to use it, well, some people are just so careless with other peoples items. On one episode a lady cracked it and threw her colleagues stuff into the river. This is a time when you really need to make other tools.
Observe has some great stuff, even if I may thankfully never will have the opportunity to put the ideas to use, but you just never know ???