Killer Bees: An observation

I went into my choo today and found that it was infested with a large number of swarming bees. The thought came into my mind that the so-called “killer bees” of America are a hybrid cross of domestic bees and African bees. So, I thought to myself, if 50%-African bees are “killer” how bad are the purebred, 100% ones? So, I shut the door and held it until they dispersed.