Plenty of stuff get reported about illegal activities at Disney World or with CM's. Just a quick search shows a man arrested for trying to bring a gun in, a woman arrested for having CBD oil, man who worked these caught stealing, and selling items, another worker caught luring kids to meet them, all this in the last month. People love reading about Disney and some really silly things get reported, like the woman suing about a bird attack. It all gets reported all over.
I mean, if Disney was all powerful and able to control the media, they would stop all these reports, not just one, and I can't find any report of it online. Leads me to think this didn't happen as OP thinks and was not a big deal. Maybe not even a taser, just someone said there was one.
At a local mall a few months ago, where a small fight broke out, a metal chair fell, and everyone thought it was a gun, people were running out and the police came in as it was an active shooter situation. Turns out two people shoved each other a few times and one threw chair. Nobody was even charged.