My questions here are: 1 - Is following up like this appropriate? 2 - Is my question on disabling cameras on-topic/appropriate?
You can certainly ask follow up questions. The usually accepted technique is to write your question and just refer to the earlier question with a link and a summary.
I also think your follow up is on topic - we do try and focus on the relationship between attack route and defence strategy, but both ends of the discussion are relevant here.