Absolutely correct.
When disassembling a glock you should always do it the way it was intended to be used by the manufacturer.
Using the Serpa as intened by the manufacturer, you can have a ND.
Intended use being the key words.
Let's not forget (since we are using the term intended use)
Be dumb and not check to see if gun is clear before taking apart.. well still would be keeping it pointed in a safe direction.
Serpa intended use is to be worn on the body.. whole drawing have a likelyhood of muzzling yourself and an ND...
Which one sounds worse.