The second Anthony informed him that Jamie was safe, Thomas left his apartment. He passed the message along to everyone else, as well as bringing everyone who had been at the apartment with him and they headed to the hospital.
Once they arrived, Thomas burst in through the doors and he asked for Jamie's location. He rushed to a waiting room where he said and shook, waiting until he could see his son. But he was alive. Jamie was alive and Thomas realised he could finally breathe again.