In an interview after the game, the 27-year-old discussed how both sets of players reacted to the news of a fan's passing in the crowd...
Question: Mats Hummels, what was it like to be on the pitch with off-field events overshadowing proceedings?
Mats Hummels: We were of course surprised, because we didn't know what had happened. We had no information, so we still had to do our jobs. We then had a quick chat amongst ourselves on the field and presumed that something serious had occurred. Obviously, the atmosphere was far from normal. In fact, I've only ever experienced something like that when I was in Paris with Germany. There were real parallels, particularly with regards to the atmosphere in the stadium. It was very quiet, yet you could still somehow sense a certain turbulence. It was really strange. Then after the game we were told straight away what had gone on. It was an excellent reaction from the crowd, particularly singing 'You'll Never Walk Alone' for the fan.
Question: So real praise deserves to go to the fans for how they dealt with the situation?
Hummels: Definitely. It's completely appropriate to behave so calmly. You should give it everything to support your team, but obviously you can't really do that [after such an event]. But by singing "You'll Never Walk Alone" the fans reacted well. It was tough for everybody, for us as well, standing there in front of the Südtribune after the full-time whistle. I think you could see that we were moved, too. We know what it means when someone collapses on the Südtribune and so for that reason we will enjoy this win in a much more restrained way than we otherwise would have done.
Question: You drew parallels to events in Paris. Did you have those thoughts on the field?
Hummels: If I'm honest, those thoughts only occurred to me after the game. During the game, I only thought that something serious must have happened. When we were in France we also noticed the change in atmosphere and I was reminded of that. It was a brief thought, more the realisation that something must have happened.
Question: How difficult is it, though, to keep calm on the field?
Hummels: It's a really peculiar atmosphere, almost like being in training or playing in a friendly in front of 30 or 40 spectators. It's not easy to keep up your concentration, but I think we managed it well. Obviously that's something you can mention briefly, but it certainly wasn't the most important thing.
Question: Despite everything, then, what is your analysis of events on the field?
Hummels: Just as the coach told us beforehand, we had to stay patient because Mainz worked really hard. We kept calm though, and apart from one opportunity they had from a corner, we gave away very few chances. After the interval, we took advantage of the spaces which began to appear more regularly. Well, we used them to create a huge number of chances. It was absurd that we were only 1-0 up after 65 minutes. The game should have been over by then and we should have had four or five goals. We won in the end, but perhaps the goals will be important again.
Question: Despite the poor chance conversion, though, it was a very mature performance.
Hummels: I'd agree with that. We controlled things and we worked hard, in particular our attackers. It may not have been perfect in front of goal, and so we had to go the extra mile. To find Marco Reus in our own penalty area at the end was an example of that. And that sort of display also means that we win our games.
Question: After his two goals against Tottenham [Hotspur FC in the UEFA Europa League], was this more proof that Marco Reus' slight dip in form is behind him?
Hummels: Marco played very well (laughing). Apart from when he shot over an open goal and one sloppy pass in the 86th minute – when I had to shout at him for a second – it was a really impressive display.