This situation occurred to our group just now.
In battle Sulfur the Sorcerer used Entice (drawing the magic sign to his palm) to lure a goblin archer out of his cover out in the open. Krii the Rogue wanted to lay low nearby and shank the goblin the moment he walked out of his cover. However, Krii's turn came first in the initiative order before the goblin had a chance to walk mesmerized towards Sulfur. We took some liberties to allow Krii to strike out of his turn after the goblin archer was out in the open but how should such situation really pan out rulewise in Forbidden lands? In D&D, Ready action (not to be confused with readying weapon in Forbidden lands) would be used. Mind you, the battle was already going on, Krii just had kept a low profile.