Sweet Autumn Clematis

Sweet Autumn Clematis

I'm in Mass, zone 6. I planted a Sweet Autumn Clematis this spring, and it's been growing beautifully over its arbor. It started flowering about a month ago, but it's still mostly buds. Or rather, was. Last night, some drunken idiots decided to uproot the clematis and rip up the arbor and dump them on the sidewalk. You can imagine what a fantastic surprise that was this morning. I replanted the clematis and watered it thoroughly. It looks distressed but none of the main stems appear to be broken, though the assholes snapped some of the roots off while digging it up. Should I cut my losses and trim the vines to about a foot/foot and a half from the ground and hope it uses its energy to root or should I keep watering it as is and hope it survives? I've had a pretty crappy morning, any advice would be much appreciated.
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