`noun + ` is an exclamatory and emphatic set phrase which is like "you know what", "on top of that", "when it comes to ...", etc. See: What does mean?
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Likewise, this somewhat emphasizes the long noun phrase, .
This rougly means "soon after (realizing) ", "once ". is an idiomatic set phrase meaning "completely wrong direction", "in a totally unexpected way", etc. I'm not sure what this refers to, but it may be related to this sense.