My feeling is the guy who closed his hood and walked away may have felt threatened especially if he was aware of CRG. Likely a bogus Z-28, IMHO.
Let's face it, most CRQ members are a step above in correct and/or detailed knowledge, IMO, about Camaros.
So many times I comment on peoples restored cars after they ask me what do I think, and I suggest, as an example, that for the level of work they did that they use the correct period correct bolt head markings and finishes instead of the shiny zinc plated ones from a hardware store.
You would be surprised how many don't think to that level of details. To us it is second nature, but now start to talk to those who don't get into the detail level we do here at CRG and you quickly will realize how much in depth you do know about Camaros.