Quote:
Originally Posted by Don Vito Corleone
dual shots is no attribute skill
any no attribute skill will not be affected with any attribute
im really sure because i use this skill when farming

You really don't play attention then. Because you don't know what your talking about.
Being not attribute linked means the skill will always work the same no matter your attribute setting.
Expertise's special effect of lowering cost 4% every level doesn't determine if it works or not based upon attribute linkage, but rather what KIND of skill it is (this is totally independent of Expertise's attribute linkage itself).
Any:
Nature Ritual (spirit)
Trap
Glyph
[X] Attack (sword, hammer, bow, axe)
Preperation
Will be lowered.
Dual Shot being a "Bow Attack" is effected.