Bumble bee rumble

Can anyone explain what I saw and heard this afternoon? I heard a bee buzzing in an unusual way, probably aggressive, but in all the years spent watching them I've never seen or heard aggression. Then I heard a really high pitched sort of screaming and saw two bumble bees, one making what looked like an attack / stinging the other one which was doing the 'screaming' noise. Then they flew off. They were not the same sort of bee, both small bumble bees not the big stripy ones, but different to each other?
Could one have stung the other, territory protection or something? The 'scream' was horrible.
Could one have stung the other, territory protection or something? The 'scream' was horrible.
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Can’t remember the name of the fly just now. I’m sure someone will.
It's nature I suppose but the noise freaked me out
Not to put too finer point on it but..... how do bees do it.
I know how Birds do it....
Their little mandibles are very useful. I located a bee by the noise it made, (very loud and annoyed), it was slightly tangled in a spider web. I helped it out and they use them to cut through web if not caught up too badly.
Sorry a little off topic.
And leaf cutters, I forget they have the means to cut those neat leaf pieces.
All is peaceful out there today thank god, they're just busy with normal stuff.