Can explosions work in space?

Excellent video as always, but sorry, but I'm totally unconvinced. In an atmosphere, the gas created by the explosion knocks into air molecules, which pass the energy along, so the air molecules ultimately deliver the destructive energy, yes? Now in space, the gas created by the explosion doesn't have to take such a complicated route -- it can travel unimpeded to the target! Why on earth would a gas molecule arriving directly from the explosive have less energy than an air molecule that is a billion collisions removed from the original explosion? Considering all the energy that is delivered acoustically in an explosion in air, I think you've totally failed to account to where that same energy goes in the vacuum case. Perhaps an atmosphere provides improved impedance matching or keeps the energy contained in a single pulse (whereas in space maybe it arrives spread out over time?), but until a more complete argument like that is brought along, I remain unconvinced that space explosion are ineffective.