Surprise update on Cox Plate runner that threw jockey

Champion horse trainer Chris Waller says Via Sistina is all systems go to Saturday’s Cox Plate despite her chances looking mighty grim four days earlier.The mare put a scare through Moonee Valley’s $5m feature race when she threw jockey James McDonald during trackwork in front of a large crowd on Tuesday.McDonald was unharmed but there were immediate fears Via Sistina would be scratched from the Cox Plate, given she ran three laps of the track riderless after losing the jockey.READ MORE: Warner’s lifetime ban over ball tampering scandal liftedREAD MORE: ‘When does it end?’: Silence deafening after ‘foul’ incidentREAD MORE: Hazlewood bats away ‘same questions’ over Test queryYulong Investments racing manager Troy Stephens said it was “very unlikely” she would be racing at Moonee Valley on Saturday.James McDonald falls off Via Sistina. TwitterWaller had to change her preparation and took the horse for a swim at St Kilda beach, before doing a canter around Flemington on Friday.”I’m…