reporter: there was 5-year-old aiden huser, separated from his mother when the shooting began. i lost her, and i was sad. i didn t know where to run. reporter: when a stranger, lindsey rogers, saw him standing alone, she stayed by his side. he was really brave and really good. reporter: lindsey and a friend posting this photo on facebook. his relatives saw it. he s been reunited with his mother. and it was last night here, we walked into that room at desert springs hospital medical center here in las vegas, where sheldon mack is recovering. sheldon? he was at the concert for his 21st birthday. i just keep seei mind still, it just haunts me. reporter: you see it all playing out still. yeah. reporter: he told me about the man who he says saved his life. some hero came and saved me, took care of me. reporter: that hero holding his finger to the bullet wound. helping him and never leaving his side. the guy that was by your side, you haven t been able to find out where