On second thought, I see where the confusion is.
The Spyderco warrior is somewhat different from the original Al Mar warrior in that the tip is less daggerlike.
Which begs the question, what makes a knife double edged? Does the saw back on something like a Phrobis bayonet make it double edged?
In this case, it's a little bit simpler, as the spyderco has a serrated edge, not a saw, on the back side, making it clearly double edged.