I’m not sure what to make of all this. Apparently there were a lot of green Taiwan flags and various banners being displayed, and there were some men wearing black caps, and some of these men were also wearing black shirts, but some were wearing white shirts, and sometimes some of them appeared to be seizing things, and sometimes the regular police got involved.
At around 1:10 in this news video, a disturbance can be seen concerning the banner(s), and at about 1:32, a still image can be seen of a man (Chen Yu-chang (陳俞璋)?) being carried away by several black-clad men:
https://www.youtube.com/watch?v=HuD2xErSe3c
At the beginning of this next video some black-clad men are carrying Mr. Chen (I guess) somewhere, and at about 0:10, Mr. Chen is seen sitting on the floor of what appears to be a police station, in the midst of a number of standing police officers. At 0:45, Mr. Chen (I guess that’s him) is again shown in the stadium, holding a different-looking Taiwan banner from the one that has been seen so far in still pictures, and at 0:55, he is again shown being carried (I assume it’s the same carrying incident as the earlier one), followed by the scene at the police station.
https://www.youtube.com/watch?v=sl6NV1Lyczo
From the above (and the below, I might add), I still can’t figure out exactly what happened, except that in certain circumstances, the word Taiwan appears to seriously set some people off, especially if it’s accompanied by language that explicitly distinguishes it from China.
In these other videos, various banners and flags can be seen, and people in unusual-looking uniforms can also be seen (I think the regular police can be seen in the third video in the group below):
https://www.youtube.com/watch?v=nHFap5WUEpY
https://www.youtube.com/watch?v=dAi4Y43CLS8
https://www.youtube.com/watch?v=_0Sr8KEbSX0
https://www.youtube.com/watch?v=A992etey6CU
https://www.youtube.com/watch?v=gHGzMYI45bU
With my near-zilch-level of Chinese, I’d better not try to do too much interpreting of what’s going on in these videos.
For the record, I favor Taiwan independence.