"Outre passe" flaking occurs randomly also, regardless of what you'll read elsewhere.
Especially when you are working with higher quality materials. Also, it doesn't always occur purposefully, ask any knapper. Caddoan blades can exhibit Outre Passe flaking, as well as many other large bifaces. However, it appears to be mainstay with certain early paleo (which is where a lot of the confusion lays).
Outre Passe flaking is basically horizontal flakes that transverse the complete face of a point, usually blowing out the other side. Every knapper must flake past the center of the biface in the thinning stages. It's an old knappers saying "If you aren't popping them past the middle, you're losing ground!". It's true. The flake has to travel at least past the center and overlap other flakes to be thinning it any. If you short-stroke it, you'll wind up with a very thick piece..lol. For points with a median ridge, the later stages of pressure flaking (after thinning) are taken only to the center.
For an illustrated reference on flaking terms and techniques, you can check here -
http://www.arrowheads1.com/flaking/primer.htm That looks like a nice piece Larson, does it show any sign of use?
