While Jessica was embracing her brother tightly with enough tears apparent on her eyes, her brother stopped stroking her hair all of a sudden. No longer feeling the sensation of care, she looked up to see why her brother had stopped, only to see that his smile was gone, and that it was replaced with a look of realization and grief.
...
While Xin Feng had been hugging his sister, he went back to his important thoughts of trying to figure out what the Demon lord's words meant. All it took for him to come into a realization was a few more seconds of thinking after his last interrupted thought, and after realizing, he was only able to have a look of despair.