Tami, on the knot breaking the line thing, the reason I have been told (but not witnessed, yet) is that at some point, the line crosses over itself, forming what ever knot you have tied. When an extreme load is put on the line, the knot tightens to the point that the bent part, that crosses over, will cut into the line, and break it there, it adds a concentrated side load the line was not designed to handle, vs. a straight pull type load.