Question!

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May 20, 2013 08:57
I don't understand well about part of the following sentences.

"When strong winds travels over water, any small items in its path, such as fish or frogs, may be picked up and carried for up to several kilometers. Sooner or later, the winds carrying them will drop their strange cargo, to the surprise of anyone below."

I don't understand the structure of the following phrase.
> to the surprise of anyone below

I will be grateful for any help you can provide.