Outburst of rage against a bus driver in the middle of the street in Luxembourg

In Luxembourg, a man verbally attacks a bus driver in the middle of the street. In the footage, he can be seen gesturing wildly and shouting in front of the vehicle, clearly beside himself, while the driver, who remained at his post, calls for help. The exact reason for his anger remains a complete mystery. And to think that public transportation is free in the country.