What do I do is I see someone threaten..?

[Joe]

There are people who look into this stuff but whats important is that you know that there are entire teams of security in the shows over seas and they check for weapons all the time. they have less rights so they can search them for the safety of the crowd. this has happened before and it normally is fake. don't call police or anything or the attention will be brought to you and not in a good way