Got it.But I did like the information on the gases it makes mixing with other chemicals.I know one time many years ago I messed up cleaning something in the bathroom with bleach and some kind of cleaner.I had to get out of that room and let the windows up,never again.
In general, it is safer to add a high concentrate base or acid to water than to add water to a high concentrate base because it reduces the chances of an injury due to it spattering. (I got that drummed into me in high school and college chemistry labs.)
I think of it as being similar to the process of tempering eggs.