From what Martha had seen, there were a lot of non humans in Taxon, but Aximili was a new arrival and obviously alien. She hadn't come into contact with his species before. She didn't know if he was hostile or if he could understand her, but ...

... wait, what was he doing? And how was he doing it?

"Hello? Can you hear me? I'm Martha. Martha Jones. You're in a city called Taxon." And you're turning into a cockroach. Right.