I think HHJP was trying to warn Mr. Baez that he is entering dangerous ground and he should not go there - he ended by saying some things are better left unsaid or left alone and he was looking directly at Mr. Baez.
I gather he was trying to shift blame and it was about to be dumped on the Defence Team for something else they failed to do.
I'm think maybe JB trying to bring up testing the SA should have done (in his opinion, of course) and maybe it open the door to something JB did along the lines of testing/not testing. Make any sense to anyone? I'm kind of baffled.