The Yautja (Predator race) have a strong code about hunting and killing prey.
The easier the kill, on an easier prey, the less honor is acquired by it and vice versa.
They tend to hunt for individual prey, not getting into a rampage in which they kill all of them.
For example if hunting for a group of soldiers, the Yautja will pick one target, attempt to kill it, and recover the trophy. It could just spam his shoulder cannon or use the smart disk to slaughter them in a matter of minutes, but that is not a hunt, thats butcher.
Also it will protect itself if attacked, and the "rule of prey" does not apply. Also it could pick the strongest prey in the group (Dutch, for example) and play a game of tension on it, by killing the ones that surround him before coming for the main target.
Experienced Yautja tend to hunt alone, but there is a major thing with the rule of three:
They start their training on their planet in a group of three, and try to go past the trails of passing. If they do, they still group up in threes, untill they manage to kill and retrieve a trophy of a Xenomorph, one of the hardest prey known to them. From then, they have permission to hunt alone, and choose their targets.
As I stated the honor is everything. If a Yautja injures his prey or disarms it, it will stop using some weapons, to the point in wich it only uses it Wirstblades to make the fight even.
There is an exception from that code of honor, and that are the so-called "Bad blood". Those are mostly the Yautja wich did not kill they prey, ran away from it etc. They are cast out from the community, with only one way out: suicide or death in the hunt. If they do not make any of this steps, they are hunted down by their own. These particular "Bad Bloods" Do not respect the code of honor in general.