Marty closed his eyes and pressed a hand over his face when Brian started talking about making everyone more comfortable, anything that man suggested was unlikely to help the situation. Though his own feelings were similar when he didn't rush to reveal his own power to the group. He had a hard enough time dealing with it himself, he wasn't about to tell everyone that he could get into their minds. At least he wasn't the only one not speaking up about powers he may or may not have.
Tim just crossed his arms over his chest watching everyone show just how much of a freak they were. He wasn't in a hurry to tell anyone, not even with Savannah there showing people what she could do could tempt him into telling the rest of them about his power. That Derek knew was enough for him.