So if you give a friend a firearm during an attack and you get separated, he could go to jail, violating the 'continuous presence' rule.
What a dimwit. What is he trying to prevent? All that will happen is that everyone who owns firearms and wants to sell have to go get a FTL, and then what? No change in safety or his ideas about 'gun violence' and Bad Guys (tm) will still do what they please.