Humans were social. That part made sense. Even the man had kept talking about a lady - seemingly more concerned for her safety then his own. But that didn't explain how their senses could work together. Well, maybe it did.
He stalked grounds further out than others. Maybe he functioned as keen sight? Protecting boundaries others couldn't perceive? It was possible.
"But I can't do that. I don't even know what you are doing." Which was safest...probably. Era didn't think she wanted to try being human... mostly. Maybe.... But what if she got stuck that way?!