Just had this situation in our group: A character suffered a E bash crit with a roll of 90 from an orcish mace.
- Neck hit. Check, makes sense.
- Bone crushed. Doesn't say which bone(s) though, which will get important further down
- Artery severed. Ouch. Guess that means bleeding to death, although no hits/rd number is given.
- Cannot breathe. We had difficulties determining what exactly that meant.
- Dies in 12 inactive rounds.
I am a rather benevolent GM when it comes to deciding results, in part because we play on Middle-Earth where death is permanent and resurrection is flat out.
That said, here's how we interpreted that particular hit:
1) Nowhere does it say the character is unconscious, ergo he remains conscious. (This was the first hit, and he had plenty hitpoints remaining.)
2) "Inactive" translates as -100 to all actions in RM, judging from how that is what applies to actions when you have lost the use of a limb needed for the action.
3) No malus is mentioned, which means there is no nerve damage. That in turn we interpreted to mean the character's "shattered bone" could not have been the neck or spine; we figured it'd be a skull or collarbone fracture instead. Also, there's no extra organ or tissue damage mentioned. Despite what the initial description would make you think, we're apparently not looking at a crushed neck here.
4) There's unspecified bleeding from a severed artery that will not kill for another 12 rounds (and even then isn't clearly spelled out as the reason for death, but it seemed the best guess in this case). In such cases our group divides the character's total hitpoints + constitution by 12 to determine the # of hits/rd the injury evidently inflicts, assuming it will kill him after round 12. As the hit is a blunt trauma, I figured it would be internal bleeding.
5) Similarly, while the character can't breathe it won't kill him for another 12 rounds at least (~3 minutes = ca. 18 rounds of oxygen starvation is held to be a critical threshold for humans in real life). No reason is given, but as there's no extra tissue or organ damage it wouldn't be a crushed windpipe. I figured it would rather be blood running down his throat (presumably from a minor injury, I don't think this could be the artery) or swelling from the general blunt trauma.
Laying on his back in the darkness and almost helpless, the player announced that he would reach for the herb bag on his belt and stuff whatever he could grab down his throat, in any order. This is allowed at a rate of 2 herbs per round (even under -100), as he hasn't lost the use of his arms and it's a trivial action.
The character swallowed Mirenna berries at a rate of 2 per round, healing 10 hits each, and thereby cancelling out his hits/round blood loss and extending his remaining 12 rounds lifespan. During the 7th round dice indicated he ingested the sole dose of Tulaxar, which will stop "all bleeding" in 1d10 rounds (rolled a 5). Thus, the artery injury was not life-threatening anymore after round 12.
It took the rest of the group 42 rounds to (mostly) clear out the orc post, establish a safe perimeter and get someone to help the downed character. In round 43, someone finally arrived to provide first aid. I handwaved this to be sufficient to rescue him from suffocation, given that the injury we had deemed the primary one (the artery) had been stabilized.
Although I had him roll for it, he didn't become addicted to Mirenna after munching down 14 berries/doses straight.