"We've seen an international buyers' [feeding frenzy] swimming around The lives of others."
Sharks and other carnivorous fish have feeding frenzies when they smell blood and find their prey.
The sentence is using this to describe the hyper-excitement of the buyers when they find themselves in a bidding war over distribution rights.
I think it is not a well expressed sentence, since the feeding frenzy is not swimming around the prey, but the participants of the frenzy are - but that's journalism for you!
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