To the right species of bee, this looks like another very aggressive bee, and it goes and bonks it on the head lots and lots of times to try and drive it away, and, of course, covers itself with pollen.
Pravoj vrsti pčele ovo izgleda kao druga vrsta jako agresivne pčele, i ide i lupa ju po glavi jako puno puta kako bi je otjerala, i, naravno, prekrivena je peludom.