i wish they had never put him on the stand...
No you wish Ito had been able to take control of his own courtroom. Those questions about the "N" word should never have been allowed to be asked. The questions were inflammatory and legally irrelevant.
Inasmuch as the questions were irrelevant, it would not be perjury to lie on the stand if the question had no relevance to the issues at trial. Perjury is a knowing and intentional misrepresention of a material fact. It would be the same as if he lied about his age. No relevance, no crime.