Dan is correct. There are no SS agents in the followup car looking BACK at TSBD from the beginning of Z film up to Z207.
Not even SS agent Hickey. He LEANS his body to his left , but his head is NOT turned towards TSBD.
So this is reasonably strong evidence to support the theory that no LOUD noise caused by a rifle firing a solid bullet ( as opposed to a blank) , from the 6th floor of TSBD, was heard by SS Agents prior to Z207.
How could they ALL have ignored/ not reacted, to a loud shot fired earlier than Z207 from the same MC rifle that supposedly fired a shot at Z223 , to which shot, they all then DID appear to react to as captured by Altgens 6 photo at approx Z255?
I do not think that hangover from the party several hours earlier at 2am Friday morning is a satisfactory explanation for SS agents lack of reaction prior to Z207 , especially when they all did react at Z 255.