Staying with the Battle of Blackwater for the entire episode was a bold choice, considering the usual structure of most episodes of Game of Thrones, but it payed off, and seriously… they couldn’t really cut away to f*cking Qarth in the middle of the battle for a a round of WHERE ARE MY DRAGONS!!!1!, could they?
Anyway. Reaction time!
(Contains hints about events in books beyond A Clash of Kings)