Benjamin turned to Ari when she mentioned air in her lungs. "That happened with Dia too," he recalled. "She could suddenly breath." He offered his hand for Ari to take, to check if she would go through or not. 
But he already thought ahead; if she was tangible and visible now they had to get her into the system too, as staff or patient. Preferable staff, of course. Patients had the tendency to mysteriously disappear. Which would mean they had to find Dia.