Bees don't agrro when attacked by [skeleton] mob, but attack the player when that mob dies

I happened to record the second half of an event where a skeleton shot a bee (so I hit record) but the bee didn't get aggressive to it. So I kill the skeleton, and suddenly the bee gets mad and attacks me.

The file attachment is too big and I even reduced the audio tracks and length... I had to put it as an unlisted youtube video _{and adobe crashed}

https://youtu.be/eTk8TqaFaj0