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Watching the film now, have to say, it's actually pretty nice looking throughout it's entirety.
I definitely agree. This section of the film in particular was quite good. Most likely thanks to Kenichi Tsuchiya's hand as animation director. Didn't disappoint.
Wow, never thought I would hear complements about a modern DC animated movie on this site. I guess Kenichi Tsuchiya did this film after he finished work on Your Name.