I half expected this to have been posted about before now, and this may just be nitpicking, but I feel like the tooltip for the level 56 Ninja action Shadewalker could be a lot clearer.

"Grants target party member the effect of Silhouette, diverting 80% of all enmity generated to your doppelganger. No effect when target is under the effect of Shadewalker."

I think a plainer description would make this skill's (amazing) utility much more apparent upon acquisition. "All enmity generated" is misleading, as the skill only affects the caster's generated enmity. Additionally, it's also unclear form this description that the target under the effect of Silhouette becomes the recipient of diverted enmity, as the mention of a "doppelganger" gives the impression of a third party receiving enmity from the target.

Granted you only need to sic an add on the healer once to realize that this skill is not a threat dump in the same way as Smokescreen, but this skill would probably see a lot more (correct) use with a clearer description.