"there, was that so hard?"
One eye shut, the other scrutinizing the woman. In reality, there probably wasn't much, if anything, Sans could have actually done to her, but he'd learned long ago that talking big was 50% of the fight. After all, if you could intimidate someone into not fighting you...
"figured as much, anyways."
His other eye shut, too. He'd guessed by her behavior that she either didn't know where he was, or she did know, and that somewhere was imprisoned.
The idea of Gaster attacking anyone was alarming--but really, was it any more alarming than everything else that had happened?
"guess that just means we'll have to keep searching."