warriorwilled:

An hour after Hope's abduction, Rex asks Avia to call her parents and tell them he needs to speak to them immediately at the Brownstone. 

Rather than hunt them down, he'll let the people with Boom Tubes come to him for ease of travel...and because most people would rather die someplace familiar than elsewhere. 

young_swimmer:

They had to spend a few days in Poseidonis before coming back to Titans' Tower due to Cait's wounds, but eventually she was well enough to make the trip. The physicians wanted her to wait longer, but Arthur needed to get back here and Cait didn't want to leave him around Ty for any longer than necessary. To be honest, she was surprised San Francisco was still standing after Arthur had already been there for a few days.

Once they reached Metropolis they called the Tower and Cait asked Ty to come and get them. Cait was in bad enough shape with two healing stab wounds, she didn't want to add any additional misery by flying.

Cait smiled after they appeared in the Tower. Teleporting wasn't her favorite method of travel, but it was still better than flying. The important thing was that she was home. Nothing felt better than coming home.

"Hello?" she called out.