Robin's proud smile only reinforces Phalanx's confidence. Look how good they've done at interacting and focusing and all of those other things that normal humans do! They even respond right away to Robin's beckon. It takes some clumsy untangling to get themself free and on their feet again, but they're quick to take Robin's hand.

And when it's time for the pair to part ways with their giant friend, Phalanx does another thing that normal humans do, smiling at Vincent-- "Bye!"