[Walter passes the ride mostly in silence, the newly-regained memory repeating itself over and over like a brand. Every indication that this behavior is fine, what are you worried about just makes him more concerned over whether his own head is on straight.]

Sure.

[Parking and locking his own bike next to Ben's, he'll follow on down to the rock, taking that offered hand with a raised eyebrow.]

Very impressive.

[His smile is a little lighter this time. Ben's been developing his Echo-granted abilities, bringing them under his own control. If he were in less of an emotional stormcloud, he might say that he's proud...]