"A survival mechanism...yes, but it's more than that." Yusei tilts his head slightly to adjust for zaShunina coming closer, frowning. So he really isn't human? The detatched arms are an obvious hint at that, but the way he talks about people, like a separate species to be observed with curiosity...

It's unnerving. Even if zaShunina doesn't intrude on his personal space, he still can't help but feel a little prickly.

"...That's...another thing about people. If someone else is hurt, we feel it like if it was our own selves that got attacked...we empathize with others' pain. It doesn't matter whether we know them or not."