[lojban] where is the magic of {nau} as sumtcita?

[la arxokuna <gleki.is.my.name@gmail.com>]

http://dag.github.io/cll/10/15/

The rule of English, therefore, is that both the tense of the main sentence and the tense of the subordinate clause are understood relative to the speaker of the main sentence (not John, but the person who speaks Examples 15.1 through 15.4).

Lojban, like Russian and Esperanto, uses a different convention. A tense in a subordinate bridi is understood to be relative to the tense already set in the main bridi.

i.e. when having no arguments {nau} has the default {le nu cusku dei kei ku} and in other words similar to long-scope {vo'a} in that it refers to the current sentence or utterance. Whereas {ca} has the default {le nu cusku lesedu'u nei kei ku kei ku}.

Then if we use {nau} as a sumtcita then it's reference to the current sentence magically disappears.

Is my understanding (especially about default sumti) correct?

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