He still looks like he's expecting the offer to be withdrawn with a laugh any second now, but he takes a few tentative steps forward. When no withdrawing or laughing happens, he finally drops his eyes to the seat and gives a tiny nod. Fine, he'll accept this strange offer. But the latter one — indicated when he gestures to Poe, then the bike, inviting him to retake the seat on it. And once he does Eshkol will very carefully and a little awkwardly climb on behind, clearly not sure at all what to do with his hands or legs.