He was very likely instructed by JW organization's legal counsel to state he did not know the particulars of the way in which the female victim (BCG?) had been treated.
Also, this is not a criminal trial, although understandably many of us wished it were. It is a commission of inquiry in which there is a fine line between thorough questioning and laying bare. As another poster said, the Commission depends on the cooperation of the various parties and they cannot shout, "Liar! Liar!" as much as they may feel justified in doing so.
Besides, the next stage will be the collation of all the Exhibits accepted by the Judge and the collation of all the information gathered which will lead to a draft report with findings and recommendations.
The hearing might be over, but the analysis has yet to begin.
Expect a damning report in which even the JW organization's expert witness, Dr Monica Applewhite will likely find her "evidence" eviscerated.