I was outside yesterday evening watching my mating nuc wondering if I could watch a queen come back from her mating flight. It should be happening any time now.

I notice two bees rolling around on the ground, a closer look and one is obviously a newly mated queen and a worker fighting. I break them up with my finger and the queen flys up makes a big circle and flys right into one of the entrances. Only thing I can think of is maybe she tried to go in the wrong one the first time causing the fight. She out right killed the worker she was fighting with. The worker was left on the ground barely moving. Just thought it was a cool to watch.