In Suits of Mist an NPC can help in combat. In particular:
Alternatively, you can aid a friendly creature in attacking a creature within 5 feet of you. You feint, distract the target, or in some other way team up to make your ally’s attack more effective. If your ally attacks the target before your next turn, the first attack roll is made with advantage.
For an example round:
- an NPC, Aiden, helps against an enemy orc
- 3 PCs attack in order: Arthur, Barton, Charles
- orc's action
- back to Aiden
Do all three PCs have advantage? Or does Aiden chose one of the PCs to help?
What if the orc attacks between Aiden's help and Arthur's attack?