As I understand it, the officer was able to fire one shot and then the gun malfunctioned. "Jammed" being a term used by the uninitiated to describe a stoppage of any kind. I have even seen it used on the news to describe a pistol running out of ammo. With the officer being shot previous, with self stated lessened ability to hold his weapon, a malfunction seems a likely outcome.
As to the British being more concerned with ADs than being prepared, the stated reason, that I read, for going with the Glock over the HP was the ability of the Glock to be "able to be carried safely yet ready to go". They cited green on blue attacks in Afghanistan, I believe. I'm not sure I agree with their take on the HPs ability to be carried safely, yet ready to go, but I ain't the ones using them.
I’m not sure where the Browning HP found it’s way into the discussion, but I agree with the concerns about the Glock, at least for concealed carry. I’m not one to ever recommend a Glock be carried in concealed carry as it was designed for use in a properly designed duty holster than both fully covers the trigger and allows totally un impeded reholstering of the pistol.
Unless the concealed carry user understands that and uses a holster that keeps the trigger fully covered, and is easily removable so the Glock pistol can be reholstered with the holder and handgun out in front where the shooter can verify the trigger is unobstructed, it’s a “Glock Leg” waiting to be born.
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The Walther PP series were the first semi auto pistols to be equipped with a DA trigger and Walther included a decocking lever in the design. It was incredibly innovative for 1929 and in contrast to the Glock was designed with an eye towards concealed carry as well as duty use.
The original intent was for the lever to be used to de cock the pistol after firing, with the lever being returned to the up position. It’s use as a decocking lever and then left in the down position as a safety was at most an option. It’s use as a “safety” as a default use was a lawyer inspired change decades later.
Stating it was a safety cleared up any import point issues after 1968 for the PP and PPK/S and in the last 5 overly litigious decades since we screwed up and allowed lawyers to advertise, it has added a layer of lawsuit protection.
In reality the PP series have heavy DA triggers with long trigger pulls, and the DA pull not something that can be lightened due to the geometry of the design.
Once you master it, the long heavy DA pull isn’t an impediment to accuracy, and it makes it very suitable for concealed carry with the decocker lever up and the pistol ready to fire. You really have to stuff it into the holster hard with an obstruction in the trigger guard to keep it go bang, and if you put your thumb over the back of the hammer, you feel it coming back as the hammer is pulled, just like a revolver.
In effect, the PP took those DA revolver “safety” concepts and applied them to a semi auto pistol.