Destroying blocking/walls when moving at a diagonal

27.5d Destroy Blocking
This character can move through Blocking terrain. When they do, immediately destroy any Blocking terrain moved through.
If crossing at a diagonal of 2 squares of blocking terrain or walls, what is destroyed?
This character can move through Blocking terrain. When they do, immediately destroy any Blocking terrain moved through.
If crossing at a diagonal of 2 squares of blocking terrain or walls, what is destroyed?