When Artie Shen suddenly attacked even before she reformed from the blood mist, the demons also felt like things were so terrifying and strange. She was clearly dead, but she still revived all of a sudden. However, when she vanished from her eyes, they were still faced with the more than twenty veined denizens that wanted to destroy them. One Zinigrid was not enough.
The denizens focused their attacks on him, however. He was the only one that could kill them… or the only one with the biggest chances of killing them. The other leaders had also stepped up, especially Maladevana. They had all unleashed their purest forms in an attempt to stall the battle. Retreating now would only result in death.