It also helps against what tends to be modeled and seen as the largest cause of injury during a nuclear scale explosion like that seen in Beirut, namely shards of glass, though it definitely helps survive falling beams in timber framed buildings.
Remember, thanks to the wonders of the inverse square law you are statistically far more likely to be in the area that gets light to moderate blast damage from the pressure wave rather than core of the blast.
It also helps against what tends to be modeled and seen as the largest cause of injury during a nuclear scale explosion like that seen in Beirut, namely shards of glass, though it definitely helps survive falling beams in timber framed buildings.
Remember, thanks to the wonders of the inverse square law you are statistically far more likely to be in the area that gets light to moderate blast damage from the pressure wave rather than core of the blast.