Ted knows that pain. And this isn't years of difference, this is maybe a few months, before they would've been able to meet. If only there had been more warning, they could've flown out there, and Joan could've been there for it, not half a world away.

"I know, sweetie.." he whispers, holding onto her and wishing desperately there was more he could do.

He imagines Sherlock feels much the same. Maybe he's even listening, with how Ted's left the door open. Ted knows it must be killing him too, being helpless while Joan is hurting so much.