Video footage played Monday at the opening of a trial stemming from the boat crash that killed two Hungarian tourists shows the teenage girl killed in the collision toss a deckhand her life jacket moments before the doomed vessel is driven under by an unmanned barge. Attorney Robert Mongeluzzi told a packed Philadelphia federal courtroom that 16-year-old Dora Schwendtner’s final moments were spent selflessly trying to aid deckhand Kyle Burkhardt before the sightseeing duck boat was run over by an unmanned barge being guided up the Delaware River by a tug boat.