Those are also soft shells, allowing that grip to seal the back side of the taco, preventing food from falling out of the tortilla. You can then eat without holding your head completely sideways, as shown. You still lose juice, but that's a losing battle no matter what, hence eating over the plate. Idk man, I think that guy might just be a rookie at the soft taco game.
If you are using household concentrations you won't generate enough chlorine gas to be harmful in a ventilated area, like outside. If you put it in a bag and huff it you are going to have a bad time, but enough to cause damage can be tossed into a mason jar, shaken, and thrown pretty safely.
Well, a 1:1 mixture of chlorine bleach and vinegar should damn near instantly and permanently corrode the steel. Don't breathe the fumes, but I have toyed with the idea of a squirt gun filled with instarust.
Yup, and you can even find it if you look at the monitors they use for online orders or on the shelf tags.