Union didn't wanna lose points from bochum. This is football when everything still remain unpredictable. Don't forget another bad result by big team from another league.
Of course, whoever the club doesn't want to lose points. However, I think the answer from @1miau really makes sense from the above, that Berlin often has a hard time playing away. Maybe there was another factor in the defeat. And for sure, I really salute Bochum's struggle so that they can beat the leader of the standings.
In this case it can be said like that because 2 of their defeats came from away games, but rather than that I feel that they are now almost back to the same point as they were last season.
Their schedule is quite busy and of course this has an impact on their performance which makes them now a little difficult and in the end they will still be under Bayern and Dortmund.