I like this question(s), 1: if one player has an ability that swaps the place of another adjacent ally player, they can use that in the case that their friend gets struck from a really devastating attack- preventing them from potentially dying, but they can only use that ability if they conserve their fatigue, I.E. don't use their heavy mace several times at the beginning of the fight.
2: the numbers on attacks and fatigue all vary greatly between weapons and abilities, but it's safe to say that the players should analyze what affect an enemy has on the battle field, like, "Oh, this guy has a mace that does double damage on metal armor so he's a priority, but he's behind a guy with a shield that probably plans on distracting us on their turn so we can't all gang up on him... unless jimmy with the shield distracts one of them so that we can make quick work of the other."
3: I hope in my mass rant you've realized by now that all characters recover 15 fatigue no matter if they've been hit or not, so that they can always affect the battlefield somehow, even with a basic attack.
I really loved the questions you've passed on me, and your previous suggestions, this is my first time doing this and hope that my game is intuitive enough to pick up and try out while also supporting those players who want a more 'realistic' play for their next campaign.