A phrase raised during the hearing was described by Tey as "downright nonsensical" - "Bad faiths mean wrong conscientious".
Mr Teng again said it was what Tey had wanted to put in the statement.
In an earlier statement, Tey had said he had given better grades to Ms Ko for two papers, in Personal Property Law as well as Equity and Trust.
In his later statement recorded by Mr Teng, he was allowed to retract that point.
On Friday, Tey said it was because by then, Mr Teng had already received information from the National University of Singapore that the alteration of grades in those two modules "had no basis whatsoever".
Mr Teng explained that Tey was "trying to confuse" him by telling him that he changed Ms Ko's grades at first and saying he did not later.
Either Teng is a good interrogator to be able to extract this confession or he made it up or Tey is so dumb to implicate himself.
Later in the day, Tey applied to recall prosecution witness Darinne Ko but was turned down by Chief District Judge Tan Siong Thye.
No reason was given. Why?