--
Ren needed time to let everything sink in.
He looked as if his soul were snatched out of him when Mikel and Alex found him. He appeared accompanied by a bright light that was noticeable within the clan—the same way the other geniuses appeared after returning to the real world.
They were worried, of course. They thought something bad happened to Ren, but he assured them that he's just adjusting to the sudden brightness and lightness he's feeling. The trial grounds were so dark and depressing that Ren had grown used to it, so being back to where it's bright, sunny, and lively required adjustment.
Fortunately, Mikel and Alex bought his reason. It wasn't really strange; they heard others felt the same way, so they left him alone after a while, and that's all Ren needed to settle everything that happened before he left.
