The host Dortmund finally won the match against each other with a score of 4-2 over their opponents Union Berlin. Actually, I was quite surprised that Union Berlin had turned things around after conceding first and thought that this time Dortmund would lose at home. But it seems that after the second half started there were two quick goals from Schlotterbeck and Julian Brandt which managed to turn things around again and made them more confident in winning this match. As the final winning goal, Ryerson did his job well which made Dortmund's victory safer.
This result raised the morale of the Dortmund players and they rose to second place temporarily, while Union Berlin had to accept the reality of being stuck at the bottom of the table again.
Yes that's right the first half was very surprising, as you said Union Berlin managed to turn the original 1 - 0 into 2 - 1 and Union Berlin took the lead until the end of the first half. Honestly, I'm sure people, especially Dortmund fans, would not have thought that their proud club would lose at home. Even though if we look at the position in the standings it is very far, where Dortmund are in the top five of the standings while Union Berlin are far below them.
The first half ended with the advantage in the Union Berlin camp and well finally the beginning of the second half Dortmund could add to their goals through N. Schlotterbeck which was also followed by goals from J. Brandt and J. Ryerson, indirectly this could already make Dortmund fans feel calm, because if they lost honestly I couldn't imagine if they had to lose at home against a team that was even far below them in terms of performance and it was clear that in the last five matches Union Berlin did not win at all. So far I see Dortmund's performance is quite consistent, they are able to crawl up which is finally now in second place in the standings behind VfB.