Having a strong grip at the back of his neck always helps. There's something incredibly soothing about the sensation--of being kept still, of being held in reality rather than let free into his own worried world.

"I... I j-just wish..."

Horatio wishes, desperately, that he had been able to do something. He wishes he remembered something useful. He wishes he could feel quiet enough to be of any use at all to the man he loved.