Eles podem fazer o que acharem melhor. Isso é abordado de forma sucinta no Guia do Dungeon Master do D & D Adventurer's League :
Adjusting the Adventure
In any D&D Adventurers League adventure, you might see sidebars to help you make adjustments to the adventure, accommodating smaller or larger groups, or characters of higher or lower levels than the optimal party size. Most of the time, this information is used for combat encounters. You can also adjust the adventure on the fly, beyond the guidelines given in the adventure, or make other changes as you see fit in order to insure your players have a good time.