When Juliet detonated Jughead there was a explosion noise and a white light. My theory is that the white light was not caused by the bomb but by The Island moving through time! Whenever the island was moved through time a white light just like the light at the end of Season 5 appeared in the sky. Could this possibly be a fair solution to the end of Season 5 and the start of Season 6??
Also, could all the characters moved through time and so not been killed?