Oh look, it's the topic he doesn't want to talk about. He shoots Ianto an uneasy sideways glance.

"Don't worry about it. I just..." he hesitates, stumbles over a few thoughts and comes up short. He just what? "Guess they just caught me off guard. But! It did go well, so I'd say we call it a success and move on to the next part of the plan."

The bit where they stop talking about this and carry on walking to the other Natha ship here.