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I've noticed that when dealing with groups of advercaries, the game almost never tells you the number or gives any guidance on how big the group should be. I first noticed it with the nekatra in Ghazali and now I'm reading Emmisary Lost. In the first scene the PCs are confronted by a group of "fake guards". But how big is the group? One for each PC? More?
Also, the rule books says:

Groups of NPCs: When dealing with multiple NPCs, you can have them perform actions as a group instead of individually.

How does that work? Does the group have one statblock?