So Culber couldn't pass through the mycelial membrane because he was made of matter from the mycelial plane. This meant that they had to send him through the bio-transporter thing, so he'd be reconstituted using matter from regular space.
This makes sense, and seems perfectly fine.
But I gotta ask - why could Tilly pass through the membrane? Wouldn't she also be made of mycelial matter if the transporter worked the way it did for Culber, so shouldn't she also be stuck there? What's the difference in their two scenarios? Why is she still made of normal matter after being transported, while the transporter replaces Culber's matter?
I figure I have to be missing something obvious but I can'


