Should not be a surprise that Envy won Split. It's their best map and C9's worst, both historically and in this tournament with their triple duelist look. C9 still have a strong chance to win this series, especially if the third map is Haven.
I mean it was utter domination, Sentinels are the best team in NA and Dignitas have already shown they can't deal with high tempo teams. Not much to say, they got slapped.