Hiro is in a perpetual state of flailing along, so tripping, windmilling his arms to regain his balance and continuing along are just normal parts of talking a walk, to him. What fun is a brisk ambulation through the countryside without the thread of falling and breaking your face, after all?

But he's coordinated enough to roll his eyes at Sam's little lecture, hopping up to walk along a fallen tree, arms outstretched for balance. "Uhhhh, you lost me at "doesn't need lasers". I didn't even hear the rest of the "in my day we walked uphill both ways and ate beans from a can" stuff."