The
very fact that Castile disclosed would lead a reasonable man to at least some cautious reassurance that this person
isn't going to try to ambush you. I mean, it's as ludicrous as the
"walk the walk" Geico commercial with the Sheriff spelling out everything he's trying to do to intimidate the outlaws -- no, Yanez, the passenger of a car isn't going to sit there and say "I have a gun" and THEN start slowly reaching for it in order to pull it on you. If he had any mind to try to get the drop on you he'd have, oh as for example,
not told you he had the gun in the first place.
For his part, the other officer who seems totally indifferent to the announcement of the gun may have been on that wavelength.