It's saying that they can do something so carefree as lying on the ground and watching the sky while so near to a mausoleum, a place of death. They are continuing as normal in the face of tragedy and opposition.
Watching through my fingers
Watching through my fingers
Something is so traumatic and hard to watch that the speaker cannot look at it directly. They regress to a child watching a scary movie; this suggests whatever is happening is too difficult to face and so they are avoiding it by ignoring it.