I've been thinking about this ever since the episode released, but the fact that Tessa's eyes are pitch black minus the yellow X's is very interesting. The human eye doesn't do that, so unless the MD universe is even more f**ked up than it already is, Tessa's eyes shouldn't be doing that. This means that Cyn literally plucked out Tessa's eye (Explaining the blood), and placed screens or something similar in her eye sockets so that her eyes would do that