Ted nods in response to promising to contact them. Ted knows there's more he could go into detail, mention all the little things he remembers, what he was thinking, and so on... but it doesn't seem vital to the investigation, and he'd rather do so after he'd had some rest.

When Joan thanks then, Ted nods affirmatively in agreement. "Yeah, thanks guys, I appreciate you."

When they leave, he sighs heavily and sinks back against the pillows.