Look at his grip. Now look at a revolver grip. Look at his hand placement during the reload. Now look at hand placement during a revolver reload. Look at the stripes on his arm. Not saying the guy was absolutely not a soup sandwich, but it is entirely possible this was a guy trained on revolvers reverting back to said training.
Learning to shoot in a vehicle is best not done the first time with a badguy throwing real bullets at you.
That is a very astute observation and may well have been under pressure him reverting to what he's got the most reps of doing...however.... one has to wonder exactly how long he has been carrying an auto on duty now? When did LVMPD switch to autos? The 1990s?
Could he have been carrying a revolver "grandfathered in" after the rest of the dept switched to autos? Maybe...But how old would he have to be now? It is 2018 now so if they switched in the early 90s (and that is a guess-I think it may have been earlier... like when Clark County and Las Vegas City merged in 1973?) and he was carrying a revolver prior to that and then at some point they forced the auto on him that he is carrying now then he'd have to have been on the dept for 20+ years now....so doing the math the revolver theory might be wishful thinking.
On the other hand maybe he shoots revolver in USPSA or IDPA?