Let me set the stage properly. I love the look of murder masks. I can't wear one myself (claustrophobia makes it hard to breath in them), but I like the look of them. To those that make awesome murder masks, please don't think this is an attack on your work, you do make good ****.
That being said...
[emphasis added]
3.1.4. Head - Area above the base of neck (exclusive).
3.3.3. Armor must be of a size to cover a significant portion (approximately one-third) of a Target Area. Armor extending continuously from another Target Area is not required to significantly cover neighboring Target Areas to count as Armor.
3.1.5. Helmet - Armor for the Head and Neck.
The above rules are the ones applicable to this discussion.
As you can see, the head and neck are considered to be a single target area for combat and armor purposes.
99.9% of all murder masks that hit the field barely cover a quarter of the head and nothing of the neck. There are a few out there that do, such as Alexi's (which covers nearly half his head). But the vast majority of them do not.
We don't count leather wristbands as armor because they don't cover enough of the arm, why are we counting murder masks?
Toss on an armor-grade hat and you're good to go. But unless more murder masks are bigger or coupled with another piece, we need to follow the rules.
What's your take?