Glock 19 gen 4 Limp wristing or?

I was shooting Glock 19 Gen 4 with a friend today. I previously put around 100 rounds through it with no malfunctions.
However, my friend encountered the following failure to feed/double feed? twice in a row:
The slide was about 1/4 away from being fully forward, a round was in a chamber at a weird angle.
I shot the gun with no malfunctions. He resumed shooting it and all was well.
Is that something that is typically attributed to limp wristing or some other gremlin?

Here is a photo:

Is the round that was partially in the chamber a live one?

Good question. Unfortunately, we didn’t look too closely at it.

i would guess limp wristing, what spring do you have out of curiosity.

I would look at trying a different extractor first.

A Glock 9x19mm pistol should demonstrate 100% reliability with NATO pressure ammo.

If this problem persists with duty/carry ammo, seek an Armorer.

What ammo was being used? If the casing still in the gun has been fired it looks like a simple failure to extract. If the ammo is Wal-Mart WWB and cheaper 9mm ammo it is notorious for having a shallow casing rims. If it’s not a problem that persists I wouldn’t sweat it. Even a Glock will malfunction every now and then despite the “perfection” slogan.

If it continues have an armorer inspect your extractor.