He pokes his katana through theside of the cube and follows it through the wall...

He pokes his katana through the
side of the cube and follows it through the wall and out the other side.
This is a hack. It is really based on a very old hack, a loophole that he found
years ago when he was trying to graft the sword-fighting rules onto the existing
Metaverse software. His blade doesn't have the power to cut a hole in the wall
-- this would mean permanently changing the shape of someone else's building --
but it does have the power to penetrate things. Avatars do not have that power.
That is the whole purpose of a wall in the Metaverse; it is a structure that
does not allow avatars to penetrate it. But like anything else in the
Metaverse, this rule is nothing but a protocol, a convention that different
computers agree to follow. In theory, it cannot be ignored. But in practice,
it depends upon the ability of different computers to swap information very
precisely, at high speed, and at just the right times. And when you are
connected to the system over a satellite uplink, as Hiro is, out here on the
Raft, there is a delay as the signals bounce up to the satellite and back down.
That delay can be taken advantage of, if you move quickly and don't look back.
Hiro passes right through the wall on the tail end of his all-penetrating
katana.