"I'll take your word for it, partner," Chara says, "The Sans I knew was. Well. I think walking around his room was a lot of movement for him. If he could get out of that, he would!" It's still so weird to hear about the differences between monsters they knew between worlds. At the same time, it doesn't fully surprise Chara that there might be one where King Sans was more active.

How uncomfortable Frisk is would be obvious to anyone. It's especially pronounced to Chara. It's clearly a sensitive subject to Frisk. Unfortunately, from the way they're reading it, it's a sensitive subject to Chara as well.

"Must have been a lot of other stuff, partner. Must be some tough customers out there too, if you really need those." They say, pointing to the weapons Frisk had bought.