Years ago they had kits similar to that with tear gas and flares, red and green if I remember right. Brother Inlaw had one and fired a tear gas round to see how it worked. I stood there in awe as a kid watching this small cloud of gas blow back at him and the fit he went into was truly impressive.
Just as funny was my older brother watching the show and he picked the empty gas cartridge and stuck it to his nose to smell what was in it. One little sniff and all the tears showed him his mistake. Who says younger brothers can't learn from older brothers.