Cool thread idea, Hussar!
I know it's not strictly what you asked for, but for a look at what 1e and 2e for the most part, also...I present the following. It should be noted that your "no magical haling rule" really doesn't/can't apply in those editions...but I'll supply an "alternate" ending that doesn't use magic.
Tom Thief is trying to Hide in Shadows to get a Backstab attack on the troll.
<DM rolls for Hide in Shadows. Fail.>
DM: "The troll lifts its head and sniffs the air. It's hollow black eyes turn to look directly at Tom."
Tom: "Aw crap."
DM: <roll attack. wince. roll damage. wince.> "The troll makes a huge sweep with its gnarled hand. Stone-hard black claws tear effortlessly through the side of your leather armor...digging into your flesh, raking through muscle and bone...The blow lifts you, effortlessly, from the ground and tosses you...15 feet away."
<turning to the rest of the players who all have pained looks on their faces> "You see the blow and Tom goes flying through the cavern to land in heavy thud and roll away from the immediate melee."
<turning back to Tom.> "Sorry. You take X damage. Which brings you tooooo..."
Tom: "Yeeeah, I'm at -5."
Rest of the party: Mike Mage, Cathy Cleric and Fiona Fighter carry on for the round. Blows are exchanged. New initiative. More blows exchanged.
Mike Mage: (to Tom) You're up. What're you doing?
Now, there are 3...options...or levels of player in this kind of scenario. And one is not really any "better" per se than the others, though I certainly have my preference.
Tom 1: says nothing. He's unconscious and bleeding on the floor, after all. Just looks over at the DM to answer the question.
Tom 2: says something non-committal or perhaps humorous. "Just laying here...ya know, bleedin'."
Tom 3: "I'M AT FRIGGIN' NEG 5 HIT POINTS! BANDAGE ME! HEAL ME! QUICK QUICK!"
We don't particularly like playing with Tom 3. But moving on...let's assume Tom 1.
Tom does not answer Mike Mage. Both look to DM for explanation.
DM: "You can plainly see that Tom Thief has not moved at all from where he landed. You notice blood pooling beneath him."
Mike Mage: "I go over and see if he's dead. I'll start bandaging if he's not."
DM: "You turn him over and see the massive tear in his side, bleeding freely, an exposed rib or two. He is already very very pale from the blood loss. You begin, frantically trying to staunch the bleeding and bind the wound, but it is very bad. Tom, you're at -6."
Now, according to 1e rules, "any assistance [generally explained/hand-waved as "bandaging them up"] from a friendly person
will stop someone sinking in negatives. So, technically, at this point, with Mike's assistance, Tom should be "stabilized" at -6 HP.
2e Non-weapon proficiencies have a Healing NWP, which somewhat stupidly if you ask me, if only available to Priests anyway! [our games, we usually allowed it for anyone, a "field medic/first aid" kinda NWP that anyone could use.] But I suppose it was a way to take some pressure off the clerics' spell use and allow for some minor healing without using magic.
S'anywho...
Mike Mage is frantically bandaging Tom Thief.
Mike: "Cathy we need you over here, this isn't good."
Cathy Cleric: "But it's almost dead!"
Tom: "So am I!"
DM: "You're unconscious."
Cathy: *huff* "Fine. I go over to where Mike and Tom are and cast Cure Light."<rolls>"Ugh. Well, you get 4 back."
DM: "Cathy invokes her nature goddess and her hands begin pulsing with a a golden light. The distinct scent of pine trees and summer rain waft over and around the thief's body. The bleeding subsides a bit and coagulates. Portions of the torn skin seal up over reknitting muscles. Some color returns to his face, though it is still a deathly pallor. He does not awaken but seems to be lulled into a comfortable rest.<to Tom> There will definitely be scarring, but thanks to Cathy, you are currently stable at -2. Still unconscious. Sorry."
Fiona Fighter: "YES! Natural 20! I'm takin' this thing's head off!"
DM: <caught somewhat offguard> "We'll see. Roll damage Fiona."
..................................................
At -2, without more magical assistance, Tom Thief will be unconscious for another 3 days...before achieving a positive 1 hit point and thus regaining consciousness. That is, of course, assuming his band survives the encounter with the troll, builds some kind of sled or gurney to get Tom someplace relatively secure and safe and he is tended for those 3 days.
This obviously, can be sped up with potions, further spells, some Healing NWP (I might allow someone with Herbalism to assist also).
But for the purposes of your "challenge", if the initial Cure Lights had not been administered, and Tom had just been "stabilized" at -6. Then you're talking 7 days of unconsciousness ("coma") before being able to get back on his roguish feet. Not very much fun for the player if the other PCs insist on continuing on their way.
As always, have fun and happy gaming.
--SD