There is no way anyone would remember this, because using the skill meant not having shield wall for another thirty minutes.
Tranq shot was a hunter tome as well.When i think about it. There were some for rogues aswell and hunters if not misaken. Was is eviscerate. Although you learned that fom the trainer later but you could get a higher rank at earlier point if not mistaken. for hunters I think it was arcane shot, but not 100% sure here.
Ontopic: Never wanting to go back is a good sign of having played vanilla.
Example- How did you get flasks?