Woah, okay, no need to beat him up over it. The question itself was a surprise, not at all what they were talking about, until Tony realized that Kate hadn't been with them all along and these last few weeks had just seemed like such drawn out torture that the days before he had left the Tower were a forgotten paradise. Why would Cassie know differently? He nodded as he pried her fingers from his arm to take his hand and squeeze that instead if she had to, more accustomed to the abuse.
"What did I say?" he replied, "Everyone's okay." Looking hurt, and not for the squeeze (not really), Tony pouted at Cassie's incredulity and lack of faith, but only for a second. Pushing that might make her really have too much faith and Tony hadn't done anything to find her other friends, if they we trapped on this plagued planet at all. He didn't know how else he could assure her, still so close to tears, so he sat back on his heels with his brow furrowed apologetically for the rocky delivery of good news.