private void removePowerToTilesFrom(int col, int row)
 {
     for (int i = 0; i < powerPositions.Count; ++i)
     {
         int xPos = powerPositions [i].x + col;
         int yPos = powerPositions [i].y + row;
         if (xPos >= 0 && xPos < StageScript.numCols && yPos >= 0 && yPos < StageScript.numRows)
         {
             PowerManagement.removePower(heroType, (uint)xPos, (uint)yPos);
         }
     }
 }