Red Guard Flame Shroud (JotL)

Just playing my way through the intro scenarios in Jaws of the Lion, I'm on scenario 4, just started my turn with Red Guard, played Flame Shroud, I read the description, it say enemies suffer 2 damage when they enter an adjacent hex, in my current turn, there are already 2 enemies in adjacent hexes, do they suffer 2 damage strait away this turn or only when moving to other adjacent hexes on their turn?