Law professor Tey Tsun Hang, 41, abruptly cut short his re-examination of his psychiatrist, seemingly out of exasperation, after many questions he tried to put to the witness were overruled.
The prosecution, led by Deputy Public Prosecutor Andre Jumabhoy, said Tey's questions to clarify the basis of Dr Michael Yong's diagnosis may be "factually inaccurate" and "misleading", and in either case should have been asked in his original examination. Dr Yong, director of psychological medicine at Alexandra Hospital, had attended to Tey last April.
Chief District Judge Tan Siong Thye agreed. After a series of disallowed questions, the judge asked Tey if he would like lawyer Peter Low, who is advising him as he conducts his own defence, to take over the re-examination.
Tey replied: "I wouldn't want to, your honour. This trial is about me. I can either swim or sink by myself." But Tey eventually relented and allowed Mr Low to take over.
Earlier in cross-examination, Mr Jumabhoy continued with his line of reasoning that the symptoms of hyperventilating and "retching" may not be due to a disorder, but simply due to stress.
He said he has heard of anecdotes of "students who vomit before examinations", and also "one lawyer who vomited before he came into court" in a thinly-veiled reference to Tey, who had an episode in court in January, to which Tey replied: "That's a hurtful joke."
Dr Yong is one of Tey's witnesses in the "trial within a trial", which is underway to determine the voluntariness of six statements he made to Corrupt Practices Investigation Bureau (CPIB) officers last April and May.
Tey, a suspended associate professor from the National University of Singapore, faces six charges of corruptly obtaining gifts and sex from former student Darinne Ko, 23, in exchange for better grades.