Best of me - extension.
Best of me was about Chip. This is the same 'Chip issue', but looking at how one of his friends sees it.
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When Xander first arrived in Briarwood, he found it hard to make real friends, he had plenty of fake ones, who liked him for his accent or because he was new. These were the ones who first told him about Chip.
"He hangs out with the twins, Vida and Madison." (Xander knew them, they lived down the road from him.)
"He lives in a fantasy world, dragons and the like, came to school last week wearing a cloak".
So when they first met, Xander already had a strong impression of Chip's strangeness, a few minutes together and that view was turned on its head, revised to a kid trying to protect himself from something.
When Xander started hanging out with Chip and his friends, he found out about Chip's parents, about how he had always been slightly weird, but had got worse after their deaths.
Xander knew that what showed on the outside was only a minute section of Chip's world, his friends glimpsed it sometimes, but they couldn't see it properly. Until Udonna showed them.
The woman in white showed them a world that Xander knows is close to the one inside Chip's head, he could see it on his best friends face. He isn't sure this is a good thing.
Xander watches Chip's two worlds collide as fantasy is becoming reality. And as reality emerges, so are the things Chip has hid from for so long.
Xander knows that one of these days, Chip is going to explode, or implode or something-plode, with trying to deal with everything alone. And he knows that when that happens, he'll be there to pick up the pieces.
Because Chip was the first real friend he found.