Standing on a massive cliff, Musk could actually see the darkness behind him. But he had no other path to take, because the front was also empty darkness, and beyond the darkness seemed some light spots. It seemed like hope, but how to get there was the issue. Looking down, he could not see the end, only endless darkness and fear seemed to exist down there, but he was not seeing any other way to move beyond this stage.
Musk had done everything to reach here, and did not seem to want to stop at this stage. More importantly he had seen the hope in the distance, as such he was thinking about any means possible. In the end he found himself looking into the darkness.