What is precisely considered a "start of battle"? Geralt can drink potions at the very start, which means before resolving the monster's "before rolling" effects and, of course, actually rolling the dice. But if the player faces a face down monster, does he have to drink the potions before flipping the encounter face up? In the opinion of me and some other players Geralt might be a bit overpowered if he drinks immediately...what should be done in that case?
Additionally, how do I play the Maribor Forest potion? Do I drink it and then decide if I'll produce a Sword a Shield or a Ritual or I get to actually choose between the three after rolling? I'm guessing the former (though we didn't play it like that).