It's more an entirely disparate world whereby the two worlds involved aren't spatially/temporally connected to each other at all. So time flowing in one world doesn't affect the flow of time in the other world and vice versa. Of course, from the perspective of the world traveler time will seem...
To add my own 2 cents, it's also emblematic of passive suicidal ideation, where someone wants to die but finds themself unable to commit (literally or in their own imagination) and ends up fantasizing about getting killed in a freak accident or something.