A four horse pile up at Doomben this afternoon has left premiership jockey Larry Cassidy and promising apprentice Priscilla Schmidt in hospital.

Schmidt has a broken right ankle and has undergone x-rays on her left leg while Cassidy is believed to have suffered fractured ribs and complained of back pain.

Schmidt’s mount Tisani Boy clipped the heels of I’m The One and came down.

It caused a chain reaction with Hussminda (apprentice Jason Leatherby) , Mohawk (Bill Abbey) and Luminous Harmony (Larry Cassidy) all falling.

Leatherby and Abbey escaped serious injury while Schmidt, the Gold Coast leading apprentice, laid motionless on the track for almost an hour as ambulance officers treated her injuries.

Both Schmidt and Cassidy were taken to Royal Brisbane Hospital.

Mohawk received minor lacerations to lower legs, Luminous Harmony was found to be lame in the off hind leg while Tisani Boy suffered lacerations to its face.

The stewards have adjourned the inquiry into the fall to enable further evidence being taken from Schmidt and Cassidy at a convenient time.

The race was won by the $2.70 favourite Requested ridden by Paul Hammersley.

Cassidy started the day well when he won the first race aboard Golden Cygnet.

He is currently fifth and Schmidt is ninth on the Brisbane jockeys’ premiership headed by Chris Munce.

Meanwhile Rosehill trainer Chris Waller has taken over the training of AJC Derby winner Shoot Out.

The former John Wallace-trained galloper hasn’t raced since the Brisbane winter carnival where he failed to win.

Waller said there was no falling out between Wallace and the Shoot Out’s owners.

Wallace won two Group 1 races and $1.9m with the son High Chaparral.

“This horse has reached the greatest heights in racing and it will be arduous task to continue on with the platform that was set by Mr Wallace,” Waller said.

“The owners have indicated that the horse may benefit from a change of environment after struggling to recapture his best form in the past 12 months.

“I feel very privileged and honoured to be taking over the training of this horse and look forward to preparing him for the upcoming autumn carnival.”