"I imagine it is not easy for someone used to existing as something else entirely," Zarya says a little airily. She's trying to imagine it herself. "I can tell the way we feel temperature is very different."

Speaking of...

"...Perhaps we should find somewhere to talk that isn't in the snow, yes? Humans can lose their body parts if they get too cold. You only have two feet!"

Which, yeah, where Zarya comes from it would be entirely possible to get replacements but also... that's no reason to actually get frostbite and let your feet drop off????