When you have Heart of Vir’naal equipped (Corrupt the Waters card) and used your hero power then the Battlecry of Silas Darkroom moves the minions left on the second Battlycry instead of redoing the first Battlecry.
is it always left ?.
I just tested this with Murmuring Elemental (Battlecry: Your next Battlecry this turn triggers twice.). It asked me for the second direction to move. And did the move correctly each time.