Orcs ferocity and spell suffocation

[Koraxs]

Hi all.
Help with understanding of next rules inconsistency.

Wizard go for a walk and have trouble with big brute orc.

Wizard cast suffocation spell and orc fail saving throw in 1-st and 2-nd rounds. Seems to be good - after 2-nd fail in case of this spell orc must falls unconscious and is reduced to 0 hit points. One round later, the target drops to -1 hit points and is dying.
But greenskin say - "I'm ferocity, birdy" and remain conscious and continue fighting even if their hit point totals fall below 0. Then he make wizard screaming girl (even if wizard is a brave men))))

So orc can ignore menace of such spell because have ability to ignore?
Such trouble is when orc cannot breathe underwater - after ...rounds creature must once more - falls unconscious and is reduced to 0 hit points. One round later, the target drops to -1 hit points and is dying. One round after that, the target dies from losting air in his lungs). But orc ignore unconcious and only may stay staggered?

[LordKailas]

Orc Ferocity keeps the creature from falling unconscious as the result of dropping below 0 HP. That isn't what's happening in this case. The suffocation spell causes the victim to fall unconscious. It also causes the victim to drop to 0 hp independent of making the creature unconscious.

This is further supported by the fact that a character does not normally fall unconscious as a result of being at 0 hp.

Disabled (0 Hit Points) wrote:

When your current hit point total drops to exactly 0, you are disabled.

You gain the staggered condition and can only take a single move or standard action each turn (but not both, nor can you take full-round actions). You can take move actions without further injuring yourself, but if you perform any standard action (or any other strenuous action) you take 1 point of damage after completing the act. Unless your activity increased your hit points, you are now at –1 hit points and dying.

Healing that raises your hit points above 0 makes you fully functional again, just as if you’d never been reduced to 0 or fewer hit points.

You can also become disabled when recovering from dying. In this case, it’s a step toward recovery, and you can have fewer than 0 hit points (see Stable Characters and Recovery).

and then

Dying (Negative Hit Points) wrote:

If your hit point total is negative, but not equal to or greater than your Constitution score, you’re dying.

A dying character immediately falls unconscious and can take no actions.

A dying character loses 1 hit point every round. This continues until the character dies or becomes stable.

[Koraxs]

LordKailas wrote:

Orc Ferocity keeps the creature from falling unconscious as the result of dropping below 0 HP. That isn't what's happening in this case. The suffocation spell causes the victim to fall unconscious. It also causes the victim to drop to 0 hp independent of making the creature unconscious.

This is further supported by the fact that a character does not normally fall unconscious as a result of being at 0 hp.

Disabled (0 Hit Points) wrote:

When your current hit point total drops to exactly 0, you are disabled.

You gain the staggered condition and can only take a single move or standard action each turn (but not both, nor can you take full-round actions). You can take move actions without further injuring yourself, but if you perform any standard action (or any other strenuous action) you take 1 point of damage after completing the act. Unless your activity increased your hit points, you are now at –1 hit points and dying.

Healing that raises your hit points above 0 makes you fully functional again, just as if you’d never been reduced to 0 or fewer hit points.

You can also become disabled when recovering from dying. In this case, it’s a step toward recovery, and you can have fewer than 0 hit points (see Stable Characters and Recovery).

and then

Dying (Negative Hit Points) wrote:

If your hit point total is negative, but not equal to or greater than your Constitution score, you’re dying.

A dying character immediately falls unconscious and can take no actions.

A dying character loses 1 hit point every round. This continues until the character dies or becomes stable.

So if i understand right Orc ferosity don't protect from suffocation spell and case when creature cannot more breath underwater???

If creature with orc ferosity fail saving throw in 1-st and 2-nd rounds of this spell he must falls unconscious and is reduced to 0 hit points. One round later, the target drops to -1 hit points and is dying...