Hmm crowd is so silent,usually when Borussia play atmosphere is great
Different crowd when the NT plays. Mostly families and non-league fans. Also tickets are way more expensive than Bundesliga tickets.
It has always been that way with international games, if the opposing nation brings more than 300 fans, they are always louder.
I was at a German NT once here in Hannover and it was a weird experience, I didn't know what to sing and felt no connection to the other people in the crowd.