Luther headed out to search at the same time the others did, not trying to be worried but not doing very well in it. His searched turned up fruitless, and as he reached the entrance again nobody was there, and he noticed Dante's car was gone. It would make sense that they all left sooner, he thought. He got in his own car, heading south and seeing if he could find the others. However, he was concerned when he saw Delilah walking to who knew where, and pulled over, opening his window to talk to her. "What the hell are you doing?" So, Dante and Sven left without her, too? If she took as long as he did it would make sense, but trying to find them by walking seemed like a fruitless effort.