I've heard the floor there is dodgy. But why only part of the stand is the question. I shall think twice about stomping in future 😕
Another possible reason could be to keep away fans together, as they're supposed to be, instead of letting them sit wherever. There's always applause right across the stand when the away team score. But short of interrogating everyone and demanding ID, I don't think it's likely to change 😼
Third option is that the floor in that area is indeed dodgy and they want the away supporters to plummet into the café for half time. They can only leave once they've bought food and drink 🍔🍟🥤 🤣
Or perhaps it's a gateway to a parallel universe 🤔...or...