The hand on his shoulder just seals the deal on this being an emotional moment for Drift. It shows on his face, and he seems to stand a little taller under Optimus' hand. Of course he knows he's not the only one who cares about Rodimus, but it still brightens Drift's spark to see Optimus so clearly looking out for him.

"Thank you, Optimus." A slight smile tugs at Drift's lips. He hopes this won't be the last time he gets to have a personal conversation with Optimus.