Honestly, they would not be surprised. If anyone can read a Sans, it would be another Sans, right? But they can drop it, if only because like a distractible teething puppy they've found another thing to chew on. His annoyance only makes them want to pester him more.

"Sounds like a close shave."

They tilt their head. A dodge that's pretty plain as a dodge.

"Was the razor boss-monster-shaped?"