That is convenient; warming up the trailer to a temperature comfortable for most humans takes awhile. Besides being a skeleton, Elsa knows Sans comes from a snowy place - he certainly had more than enough jokes ready to go when they first met. She didn't appreciate it back then, but a lot has changed in two years. She would much rather be listening to another joke than having this conversation.

"You were captured and then taken somewhere." She just assumes that must have been the case. "Is that where you... were hurt?"

She hesitates on the last two words, not sure how much Sans really wants to tell her. He can answer the question with as much or little information as he wants to.