The battle wasn't over yet.
The forces outside of the dome, or the other members of the Z-Company, were only being temporarily held by the four Elysiums. He didn't even know how long they could last.
Wallace wasn't planning to eliminate all the three hundred members of the organization on the island but he wanted to create enough space for him to take what he needed.
He glanced at his spaceship and saw the spherical glass covering it. He remembers that after breaking this glass, a powerful wave of pressure would come down to everyone on the island.
It happened before when it was accidentally destroyed by Yumi. It would only attract more trouble. This time, he made sure not to make the same mistake as he can use this later.
Within this dome, only five more researchers were left behind as they tried to hide within a sheltered magic room inside one of the remaining buildings.