Toby didn't know how to take Claire's admission. Did she mean that she literally couldn't die, or was she just trying to be an adult and tell him that she was far less likely to die than he was as a child? It never occured to him that she might literally have powers like Peter did, but even had he known his actions likely wouldn't have been that much different. He wasn't the sort of boy to just leave those he cared about. Toby had literally prayed to the forces that ruled this version of LA to let him come and find his sister, he wouldn't have abandoned Claire to deal with the Goblin King.
His gaze shifted back to the spot, half expecting a screeching owl to land there again or for Jareth to simply materialize on the very spot he had vanished from. Toby didn't register that Peter was standing in front of him at first, or even realize that he and Claire were no longer alone, because the ground that Jareth had just died on was all but burned in his memory. When he did finally blink, finally see that Peter was there, he nodded shakily. "Yeah..." He took an uneasy breath. "He's dead, Peter."