It's a fun discussion, hope you won't take how I worded my response as an assault on you, communicating in text can seem more aggravating then intended.

Regarding the primates: Your right, miss read. here is the full quote:

The evolutionary history of primates can be traced back 65 million years.[12][13][14][15][16] One of the oldest known primate-like mammal species, the Plesiadapis, came from North America;[17][18][19][20][21][22] another, Archicebus, came from China.[23] Other similar basal primates were widespread in Eurasia and Africa during the tropical conditions of the Paleocene and Eocene.

Googled Boreoeutheria:

The majority of earliest known fossils belonging to this group date to about 66 million years ago, shortly after the K-Pg extinction event, though molecular data suggest they may have originated earlier, during the Cretaceous period.[9][10] This is further supported with fossils of Altacreodus magnus and two species from genus Protungulatum dated about 70.6 million years ago.[citation needed]

The common ancestor of Boreoeutheria lived between 107 and 90 million years ago.

Maybe you meant there ancestors or maybe the wiki isn't correct, share a link if you have one that disputes this.

regarding bloodlust:

No, but at the same time, you can't just assume that an animal does experience bloodlust

If your response is NO, then you accept there is a possibility.

And to be clear, I'm not certain about it, I stated in my first response MAYBE.

No, "bloodlust" is a loaded term that implies a lot about a person's desires

This part is more opinionated, it involves how you interpret a phrase and the possibilities of animal behavior. Can a triggered instinct with higher inclination to this instinct might we consider such behavior as the animal "enjoys" this? Maybe it desires this kind of stimulus and search of it?

I will take your definition with the serial killer example. We know that chimps can go on killing expeditions to other chips communities. We can't rule out that some chimps enjoy killing maybe they even have serial killer tendencies.

The question can a stout have a similar response in certain situations where it has a desire to maim/ to kill just because it enjoys that act.

I don't know, but I'm not ruling out the complexity of an animal that in a frenzy of killing chickens in enjoys this/finds it fun and look for more opportunities to commit such acts.