Dread Weapon Property

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Dread Weapons have the following property:

"On a critical hit the target takes the weapon's enhancement bonus as a penalty to defense and checks until the end of your next turn."

Do you have to use the power through the dagger to benefit from this property? As in, if you are a dual implement sorcerer, do you impose the penalty if the crit was from a power used through the other dagger?

I ask because in the other hand, the Wyrmtooth dagger has the following property:

"When any enemy's resistances or immunities reduce the damage of any sorcerer attack power you use through this dagger, you gain 15 temp hp"

Notice the difference: this one explicitly requires you to use the power through the dagger.

Oh, and is the Dread Weapon's property affected by Fear immunity?