Why didn't they use Foil to the fullest extent possible?

In the Behemoth fight, Skitter uses Foils power to cut off Behemoths leg like it was butter, why didn't they do that with the other Endbringer fights? Have two fliers/speedsters hold different ends of a length of wire, have Foil use her power on the wire between the two movers, then have the movers lop off pieces of the Endbringers one after the other. Hell, she could have used her power on the blade of Chevaliers sword, then he could go 1v1 against an Endbringer.