Blade walking was debuted in Summer 2008 with the treacherous blade bridge. Shown below is the first version of the bridge. Krystine's next version will be higher so that she can drop a pumpkin or watermelon straight through the blades. It will also have a few more machetes to eliminate the need to lean on something as well as allow for an act that has probably never been performed.
The current version is of similar construction to the one shown below, but with more machetes and the ability to be bolted to a pair of crates to elevate it. It can be crossed without leaning on anything.
Got a watermelon you want sliced? Watermelons go right through the blades.
Krystine can use her bridge like a bed of nails.