Using Will to get back on your feet.

When a sorcerer succeeds in their Will roll to temporarily regain Stamina (or some other score), they regain the score they were trying to get back simply by rolling any degree of Victory. For example, if they have a Will of 5 want to get a functional Stamina of 3 this round, they roll 5 dice against 3 dice and get all 3 dice for Stamina if they get any victories at all on the 5 Will dice.

The sorcerer gets one action at the restored score (ignoring ongoing penalties), then goes back to suffering whatever lasting penalties they were suffering (the temporary penalties that would have affected that action have now elapsed). If the sorcerer is still in the hole Stamina-wise, there's no reason they can't do a Will roll again next round.