Larian Studios Forums Baldur's Gate III Baldur's Gate III - General Clear Examples That Show We Need Proper Reactions

They still not use predeterminate reactions and they allow the player to decide if they want to take the reaction or not or against whom, at least in the kickstarter demo. That´s an ok in my book =)

Well they can play the animation when you decide if you want to block or not, or run or not, or use the shield or not, counterspell or not, dodge or not, or even easier, when the enemy damages you if you want to use hellish rebuke or duelist to retaliate...You always react against the enemy´s actions, ergo the game engine knows what is going to happen, so they can check if you can react or not to the action of the enemy, so they can ask after the enemy attack/spell/etc connects, and if you react, you just play the animation.
that´s how the game "The last remnant" handles blocking and dodging in the enemy´s turn: an input UI appears before the enemy`s attack and you get to react or not. If you react, you block and/or evade and retaliate, if not the animation plays out and the enemy hits you.