How does the aunt underestimate the children in Saki's "The Storyteller"? I've read this over and over and I"m not finding the answer.

In "The Storyteller," the aunt underestimates the
children's attention span. She underestimates the children's ability to show interest in
any story. She has tried everything to keep them quiet. She tells them a story of which
they have no interest. The man traveling in the train car with the aunt and three
extremely inquisitive children, to a point of being annoying, inserts that the aunt did
not tell a very good story:

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'You don't seem to be a success as a
story-teller,' said the bachelor suddenly from his
corner.

The aunt, offended,
responds:

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'Perhaps you would like to tell them a story,'
was the aunt's retort.

She
underestimates the children's ability to sit quietly and listen to the bachelor's story.
She could not keep them quiet with her story. She could not keep the children interested
in her story. She underestimates the children's ability to actually become interested in
any story. The aunt thinks the children will react to his story the way they have
reacted to hers. When the bachelor is able to command the children's attention, the aunt
tries to hide her admiration during the bachelor's story
telling:

The
aunt suppressed a gasp of
admiration.

Truly, the aunt
is impressed that the bachelor has maintained command of the children's attention.
However, by the end of the story, she reprimands the bachelor for telling such a story
with such a terrible ending. She insists that his story has been most
improper:

'A
most improper story to tell to young children! You have undermined the effect of years
of careful teaching.'

The
bachelor smugly responds:

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'I kept them quiet for ten minutes, which was
more than you were able to do.'