Although the horizontal line formation most likely would not stay intact for long due to the simple-mindedness of the demons in front of the horde that would sooner or later change the direction of where they were moving, closing off the horizontal line into half a circle before merging back with the other demons from the middle of the horde as they chased after Blake, the current status quo was enough for Blake to do what he wanted.
It had given Blake the chance to go into a more personal distance with the scrawny jet-black necromancer without having to be worried about the hundreds of demons in its army.
Blake would be dealing with a few dozen demon mages, but he was more than ready to use his rune formations to deal with them.
Before Blake did a 180 degrees turn and dived towards the necromancer directly, Blake continued moving forward, slowly bringing the horde to the other side of the forest where a certain demonic gorilla was ready to wreak havoc among them.