Abby doesn't 'become visible' in the sense that a spell fades, she's simply is recognizable as a person, who exists, where she's sitting on her ass in the desert. "If you die what are the odds I get back to the city?"

It was the obvious question, he told her not to follow, she did. She didn't really do a lot, but she did need to know exactly what she was in for. Absolutely not prepared for it. In any way. Not the sight, or the acid guts, or the smell.

"You smell disgusting." Very helpful Abby. She hasn't made a move to get up yet. Cause of the shock, mostly. She doesn't appear injured, and her heartrate is steady enough.