The question the defence asked of Botha was - could the witness hearing these arguments be 100% sure they came from OPs house from that distance. It's a rhetorical question really because of course the answer would be no.
This is one of the strange things about the way this is done there.
The defence are asking Botha awkward questions about other witnesses evidence. he cant answer for them.
They clearly know that, and know it will cause people to come to their side.
Thankfully, the Judge will know too.