Nebula was mostly worried by Erwin's wild gaze from the start. He seemed to have this untamed fire in him that just needed a little bit of a push to get him all started up and she could tell he lived for the thrill. She was most amazed by how he knew so much about so many little things like finding the weak link on her chain simply by mere touch and perfectly slicing the chain in half with a blue spark coated hand. A flat hand chop to the chain and suddenly, her freedom had been achieved, at least momentarily.
Now the hard part of it all was getting out undetected but somehow, Erwin did promise that he knew away around that as well. And going off from all that he had said and mostly delivered, she was beginning to count on his words.