Being in Africa, and not knowing what the type bees you have
African killer bees of course :-D
Actually the bees we have here are the nice ones and keep to themselves. I suspect they are very similar you your's, if you don't hassle them they won't attack. If you're on their wrong side they do stand together tho.
The Cape province have a bee that would invade other bees. If there are some invading I think one would see a type of war going and some dead bees. None of that here.
The reason for me thinking they were afterswarming is I saw a few drones buzzing around the hive, possibly from another hive. These were fiercely attacked by the bees, even looked like aerial tackles !
In case of an afterswarm, does it mean that more than one queen moved into a hive ? The hive was occupied for about a month, could a new queen emerge that quickly from scratch ? Sounds a bit soon.
I have very little bee experience but would want to learn a lot more. So pls tell me everything you know :-D