Conversation so far:
Why was there an assassination attempt on Hendrik Verwoerd?
David Pratt claimed he had been shooting 'the epitome of apartheid'. However, in his defence, he stated he only wanted to injure, not kill, Verwoerd.
Why did David Pratt want to hurt Verwoerd in any capacity?
The court accepted the medical reports submitted to it by five different psychiatrists, all of which confirmed that Pratt lacked legal capacity and could not be held criminally liable
Why couldn't Pratt be held liable for the attempted assassination on Verwoerd?
The court accepted the medical reports submitted to it by five different psychiatrists, all of which confirmed that Pratt lacked legal capacity
What else can you tell me about the assassination attempt on Verwoerd other than why was an assassination attempted, why Pratt would want to hurt Verwoerd, and why Pratt could not be held liable?
Colonel G. M. Harrison, president of the Witwatersrand Agricultural Society, leapt up and knocked the pistol from the gunman's hand.
Was anyone else involved in thwarting the assassination attempt on Verwoerd besides Colonel G. M. Harrison?
After the pistol fell to the floor, Harrison, with the help of Major Carl Richter, the Prime Minister's personal bodyguard, civilians and another policeman overpowered the gunman.
How was Pratt arrested?
Pratt was taken to the Marshall Square police station and later transferred to the Forensic Medical Laboratory due to his peculiar behaviour.
What happened after Pratt was taken to the Marshall Square police station?
Within minutes of the assassination attempt, Verwoerd—still conscious and blood gushing from his face—was rushed to the nearby Johannesburg Hospital.
Did Hendrik Verwoerd undergo surgery?
Once his condition stabilised, Verwoerd was transferred to a Pretoria Hospital. Specialist surgeons were called in to remove the bullets.

Question: What did they do to him?
Self-contained rewrite: What did the staff at Pretoria Hospital do to Verwoerd after removing the bullets?