There is no single set of assumptions, but most hosts use the following restrictions (usually shown in the Role Descriptions before the game starts):
- The Doctor cannot save self more than once (or none at all)
- The Doctor cannot save the same person twice in a row (back-to-back / two consecutive nights) unless fewer than X players are alive (usually X=5).
In rare cases, these restrictions are revealed only to the Doctor, but usually hosts make the restrictions public or answer about the existence of such restrictions both in the game thread and in BTSC or via PM.
Saving role, protecting role, defending role, guarding role, Doctor, Healer, Medic, Paramedic, Herbalist, Apothecarist, Bodyguard, Defender.