Sulu realized that maybe he should have said something to help move the conversation for Ianto, to make it easier for him, but... A part of him admittedly thought that Ianto deserved this sort of situation. He couldn't help it; Ianto had lied to him as well, and he hadn't had time to properly argue about it when it had happened. Jack, however... Jack had every reason to be upset, and he wasn't dealing with Ianto passing out on him at the time, so he could properly react to it.

Still. He knew he had to say something, he just didn't know what. He chewed his lip for a moment before deciding to try and help Jack at least understand that, as bad as this was, it wasn't the end of everything. Ianto wasn't dying all over again, and there was something they could do to fix it. "He passed out on me when we went to come downstairs. I'm going to talk to McCoy and see if he can't help, now that we know there's something that needs helping." He could only hope that, for all of Jack's anger, he would realize that Sulu understood how he felt. The last thing he thought Jack needed at this point was to feel alone.