He is not 'reading the tea-leaves in a cup' or 'reading the pages of a book' - he is 'reading about' all the trouble that the Yellow Scarves are stirring up. He may be reading about this in a newspaper:
Reading (in the newspaper) about all the trouble the Yellow Scarves are stirring upů
Reading/hearing/learning of the trouble the Yellow Scarves are stirring up, I decided to...
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