fly backwards several feet

Mr Combs, 37, then allegedly swore before hitting Mr Rechnitzer, causing him to "fly backwards several feet" into a vehicle behind him.

What does `swore', `fly backwards several feet' means in this sentence?

For more context,
BBC NEWS | Entertainment | Rapper Diddy sued over 'assault'

Please explain me.

Swear = use obscene language
fly backwards- hit him so hard that he fell back a few metres