I'd like to point out that Corey's death was shown in the gym, which was a callback, not foreshadowing. Now, remember what Shade said: "For forsooth, *from foreshadowed,* only 2 will be taken." I believe this means there is still a chance Lin will die somehow. Not saying it's fact, but I feel it is a very plausible theory, especially given how Shade is.
Just a thought.