That scene cannot be done in 3e.
Yes it can and in fact it is in 4e that it is highly unlikely to be replicated.
Hussar said:
In 3e, once you've gone below zero hp, you're done. It's been argued very eloquently that a character that drops below zero is most likely going to die, but, even if he stabilized, he still couldn't fight.
This is actually the classic case of a PC going into the negatives and miraculously surviving without help. Remember, the force is
strong in this one.
1) Luke who appears in good health is ambushed by the wampa, struck once and goes unconscious - into the negatives in either edition [or ii) below looks at an alternative for this]. He is then dragged to the Wampa's cave.
2) Time passes (undetermined).
3) Luke regains consciousness uses the force and kills the Wampa.
In 3e, there are two possibilities:
i)Luke got struck down to -1 hps and stabilized and made all his checks and begins healing naturally back 1 hit point to zero in the wampa cave while it dines on tauntaun (this means Luke has to be able to rest for 8 hours). I'm not too sure how well this fits in with the time frame of the story. While at 0hp and at only a standard action each round, Luke kills the wampa and escapes to eventually be found by Han. The vision of Ben Kenobi just before this indicates that the "force" is definitely at subtle work here.
[The time spent healing is questionable and undetermined, particularly in relation to time spent unconscious or possibly asleep and "resting". While the peculiarities of this situation are unlikely it is somewhat possible if Luke only "just" went into negatives and is of higher than 1st level (a given I feel in "3e")]
ii) An alternative to this is that you could say that Luke had taken
x amount of exposure nonlethal damage by being out on patrol in the bitter cold of Hoth. Let's say that the Wampa blow does damage leaving Luke with
y hps. However, if
x exceeds
y then Luke is knocked out and recovers 1 nonlethal hp an hour. If the difference
x -
y is 3 or less, then that gives luke a couple of hours of unconsciousness and that fits in more securely with the expected narrative I feel with the timing of Luke's escape and Han's rescue of him.
In 4e
Luke gets struck down from full capacity to negatives in one hit. Conventionally speaking using 4e this is highly unusual (where as in 3e a big critical hit on a flat-footed target is a little more reasonable).
Luke now has to stay unconscious for an undetermined but certainly not trivial period of time. Let's say it is for about an hour at minimum. Now because Luke was seemingly at capacity, he presumably has healing surges to burn (he certainly does not appear to be at low or zero surges). And so all he needs to do is make his "20", and then second wind (or if used [unlikely given he was at capacity] short rests before surging away) and bam he's back into the action. Except he stays unconscious for quite a while. In fact so long that the chance of Luke not rolling a 20 and not getting more than two strikes quickly fades to a practical value of zero. He can survive unconscious for a minute (without saving with a 20) but the chance is about 4.5%. He can survive for two minutes but the chance now drops to about 1 hundredth of a single percent. Surviving in this style for about an hour is not exactly reasonable (although again, you could say that the "force" plays a part in this).
The other alternative is that Luke does save (roll 20) in a reasonable time frame (a matter of rounds) but for some reason does not use his second wind when being dragged back to the cave (although again this is compromised by the fact that Luke is still unconscious or at best asleep in the cave [narratively knowing Luke, waiting in such a way until he has been pinned into the cave roof makes little sense]). Why not act with the light sabre as soon as possible? Or perhaps he waited 10 minutes in an unconscious state being dragged back to the cave (statistically incredibly unlikely but again with the force acting) before recovering. Or perhaps Luke wasn't at capacity (having already used his second wind and not recovered it) and had not taken a short rest (again highly unlikely). Thus he needs to wait for a short rest (although as soon as he makes his save, he is supposed to be conscious - maybe he's just taking the opportunity for a quick nap

). I have the feeling 4e "should" be able to replicate this but I'm struggling to come up with a reasonable narrative that facilitates it using the mechanics at our command.
And so, I think the point is that neither edition easily facilitates the wampa scene. I think it fair to say that the "force" was at work protecting Luke in some strange way and this is not conventionally facilitated by either of the rulesets although the ii) 3e option I think is the most easily adapted mechanics-wise to the scene.
Again interesting discussion.
Best Regards
Herremann the Wise