Oscar Pistorius was not wearing his prostheses when he broke down a door to reach his girlfriend after he shot her, his murder trial has heard.
The forensic evidence contradicted Mr Pistorius’ claim that he was wearing prosthetics at the time.
The door has been brought into court to be examined during the murder trial.
Mr Pistorius denies intentionally killing Reeva Steenkamp in February last year, saying he fired after mistaking her for a burglar.
There is also a toilet cubicle in court, says the BBC’s Pumza Fihlani at the court in Pretoria.
It is a replica of the toilet in which Ms Steenkamp was shot.
The court will hear forensic evidence on the location of shooter, the grouping of the shots and their trajectory.
Cross-examining, Mr Pistorius’ defence team asked the forensic expert to kneel and lift his feet, which caused him to wobble.
The defence team claimed that Mr Pistorius therefore would not have been able to balance on his stumps and break down the door using a cricket bat.
The prosecution witness argued that if Mr Pistorius was balanced enough to fire a gun, he could also break down a door with a bat.
The trial is now halfway through its second week, and is expected to feature over 100 witnesses.
Earlier on Wednesday, a friend of Mr Pistorius claimed that the star had driven at 200 km/h (124mph) and that he had taken a picture of the speedometer to prove it.
The defence team alleged that Darren Fresco was himself driving at the time and had therefore fabricated evidence.
On Tuesday, Mr Pistorius’ defence team questioned a pathologist’s finding that his girlfriend had eaten less than two hours before he killed her.
This contradicts the athlete’s account that the pair had been in bed for several hours before the shooting.
The state is seeking to convince the court that Mr Pistorius and Ms Steenkamp, a 29-year-old model, and reality TV star, had an argument before the athlete fired the shots that killed her.
There are no juries at trials in South Africa, and his fate will ultimately be decided by the judge, assisted by two assessors.
If found guilty, the 27-year-old, a national sporting hero dubbed the “blade runner” after having both lower legs amputated, could face life imprisonment.