You walked into the Common room you saw Mountain and Sodo on the floor, so you asked "What are you guys doing on the floor?"

Sodo and Mountain both turned their heads to you and Sodo answered

Sodo: "Mountain threw his back out trying to pick something up and had to lay down. I told him not to do it, but he wouldn't listen…He looked kinda pathetic and I felt bad, so I joined him"

You answered with an "Oh okay. I'll join you guys then"

Mountain: "…Please…I just want to get up…"