The Cost of Discontinuous Gameplay

I was trying to do a mechanic like Domino from Dishonored for those who don't know that it's a spell the way you link people and then what happens to one happens to the other. In their turn-based game with a grid it's even harder I thought like we're doing a simpler version it would be easier but like the case that killed me was if two people are standing opposite sides of a grenade that's gonna knock them both back and you link them so that the same thing happens to whatever happens to one happen to the other how the hell do you resolve that question? There is no solution I can pick where every player is gonna be like oh yeah I see why