I totally agree with you, seen in that match union berlin underestimated bochum too much, union berlin appeared surprising after they managed to beat dortmund, leipzig and managed to hold Bayern. Bayern must be very happy with this union defeat. tomorrow union will face Braga in the European league, don't know if they will lose or win against Braga.
SC Braga is one level above Union Berlin in the Europa League group standings with a very thin point difference. But I don't think that Union Berlin will let SC Braga win in that match, moreover it will take place at Union Berlin's home ground. Which is a motivation for Union Berlin to get full points and also to get a better position in order to qualify for the round of 16 later after the final match in early November.
Union Berlin started really bad the Europa League session and only in the last two games that they won against Malmo they recovered a lot of points.In this match it is paramount for them to win as that would also secure them higher chances for qualification if they manage to beat Braga.
However it is exactly in such games that I avoid to bet on,when a team needs absolutely to win in order to achieve something,there is big pressure under them and this may not always translate in better motivation and better play in the field so I refrain from betting here.