I don’t understand the excitement about the penalty kick. The Schalke hits the Bremer in the foot, so that he obviously and unnaturally (something like that would not be possible without outside influence) takes a tipping step before he falls over. The difference is that the contact happens when the foot (or step of the Bremer) is on the way down.
The contact at the foot is definitely there, the sequence of steps is definitely hindered and the result is a fall for the Bremer. The whole thing is difficult, but clearly recognizable, just look again soberly and don’t just persuade the commentators
EDIT: PS here a Schalke posted it again. This wiggling or twitching of the foot of the Bremer would not be possible without external influence and leads to a fall, especially at speed.