The IO lost patience during the questioning and admonished the prosecutor for asking questions that were impossible for a witness to answer. "Stick to what is possible for him to know" he said (not a direct quote).
As you say, the IO won't be impressed by the prosecutor's knowledge of visibility conditions inside two houses in Haditha on the morning of Nov. 19 2005.
Hopefully, the NC Times will flesh out this report later today. I really want to hear what the IO said in closing.
A group of children on a bed could look like one big person under the covers.