English usuage question

I recently found on a piece of electronic stuff the instruction "The power
turns off by pressing the button". I thought this was an odd way of putting
it, and said so. But a there-present girl, who like me isn't a L1 speaker of
English, insisted it was a perfectly normal expression. I still it's
somewhere on the line between weirdness and ergativity. So, what does the
Native Speakers (tm) on the list think?

                                                   Andreas

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