Outside of Greed's Sanctum, Grace was staring at the thirty stones that formed the rune diagram which open the portal Jack had entered. She was studying them as she tried to remember what Jack had done.
Her mana sense, although had improved tremendously, was still not as good as Jack's. She was having trouble sensing the links between the power nodes within the diagram and where they should be moved.
She had made several tries all this time but without success. Luckily this diagram, as she found out the first time she failed, was not the type that caused a backlash upon failing.
She didn't give up despite the consistent failures. She still couldn't contact Jack. So, wherever Jack was, he was still inside where that portal had brought him. He might need help.
Furthermore, despite still not yielding results, she felt that she was one step closer with each attempt. Her mana sense was also improving with this practice.