Couldn't find this mentioned in other entries, so..
When an NPC gets frightened, they use (some of) their movement to get away from the character they are frightened by. However, they can still use actions, attacking my other teammates.
If one of my characters becomes frightened, all control is taken away from me and I am unable to attack anything, take potions or even just use jump so I don't take damage running through inevitable dangerous terrain.
(I don't know why the 5e rules weren't used for this condition to begin with.)
