I am not sure, I remember having the impression that Harry was making specific time travel plans in response to meeting the patronus. They had already travelled backwards in time, I am not sure how much time has passed. I will re-read the chapter later tonight.
Though if it was non paradox causing either way, then the patronus was acting in accordance with another global law of the HP:MOR universe: it was more awesome for the patronus to meet Harry in Azkaban and make the situation more complicated.
I am not sure, I remember having the impression that Harry was making specific time travel plans in response to meeting the patronus. They had already travelled backwards in time, I am not sure how much time has passed. I will re-read the chapter later tonight.
Though if it was non paradox causing either way, then the patronus was acting in accordance with another global law of the HP:MOR universe: it was more awesome for the patronus to meet Harry in Azkaban and make the situation more complicated.