Thanks to a rogue rock, Steve is almost incapacitated early in the episode, and Danno is left a bit helpless with nothing more than a signal-less smart phone and “graffiti on rocks”—that’s a petroglyph to most people, Danno—to help him. All is solved once the chopper gets there with Chin Ho watching worriedly, and Steve throws Danno a little pidgin “thanks, brah” as Danno mimes an impromptu sign language “I heart you” to his injured buddy. He, of course, breaks into “Steve the Science Guy” and gets his CSI mind working on the dead body he and Danno found before he encountered the naughty stray rock.