So i've been playing this game with friends and realized after watching videos of people playing scenarios that we havent been engaging properly with the enemies (i.e moving to a location with a readied unengaged enemy and engaging them with the investagator) and i also realized we havent been exhausting enemies after they attack. so my questions i guess are:

1. do enemies exhaust after they attack in the enemy phase?

2. Does that apply to enemies engaged with investagators or does it only apply to enemies unengaged?

3. If an enemy is engaged with an investagator and they attack do they continue to stay engaged or do they unengage and exhaust until the next enemy phase?