When Ken came back, Dale, Dave, and Isaac were getting into the dorm too, and they said, "Ken, we just saw Catherine."

"All right."

"Surprisingly, why didn't you say 'it's none of my business'?"

Ken ignored them without giving a glance at his roommate.

"Catherine is getting into trouble. Obviously, someone wants to hurt her. Alas, she is too popular to get away from troubles."

Since Ken said nothing, Dave added, "Ken, is there something you want to say?"

"Nothing."

"By the way, why did ...