The formations that covered the entire laboratory were high level isolation formations. Due to those formations, even the aura of the hunters could not go out of the laboratory. Those formations were also the reason Evan was not able to feel the aura of Amara and other humanoid monsters before entering the laboratory.
When Amara brought Evan into the lab room, he noticed the same formations that were covering the entire laboratory.
Seeing those formations, Evan realizes that it is his best chance to take out Amara because no one will be able to tell what is happening inside the lab room because of the isolation formations.
Evan wanted to stop Amara from escaping using the Escape Scroll so he used the second effect of the growth link skill and took the skill 'Sonic Barrier' that could stop her.
