Galen had been half paying attention to the Force. But the moment Luke entered the precinct, Galen let his mentor sense how he was. A few bumps and bruises, some cuts, but it was clear that Galen wasn't bothered in the least by his state. As he had told Olive, he had endured far worse than what the crash had given him.
Watching as Olive went to the man that must be the Harry she called, Galen waited a beat before he rose smoothly to his feet and moved to Luke. Years of training with Vader, of having it beaten into him, he lowered his head. He marked it as a good thing that he didn't fully drop to his knees like he would have if Vader had been there.