Tree Falls in Central Park and Knocks British-Sounding Girls ‘to the Floor’

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If a tree falls in Central Park and knocks down two girls with English-sounding accents, does that mean that it falls on the "floor" and not the "ground"? Because that's what the girls said when the tree fell on them (happily, not injuring them) Saturday near Fifth Avenue and 66th Street: "We were just sitting there and it just fell on top of us, that was it and the next thing I knew I was on the floor," said one girl. Then her friend said "floor," too! Is that a U.K. thing, calling the "ground" the "floor?" Because there's no parquet or hardwood in Central Park, ladies. [NY1]