Here is how I have always played him.
The scout has 2 Claw Spikes and 2 Elbow Spikes.
The Elbow Spikes are free when using Back Stab.
If we assume that the Scout is not attacking from behind. He gets 2 attacks with the Claw Spikes, one at normal, one with the standard -4 for Secondary.
If, however, he is attacking from behind, his damage potential increases considerably. He gets basically 4 attacks, which work like this:
Attack #1: Claw spike (no modifiers), Elbow Spike (Free, no modifiers)
Attack #2: Claw Spike (-4 Secondary), Elbow Spike (Free, no modifiers)
I haven't nicknamed my Scout "The Cuisinart" for nothing.
