Since the outset of last season, Curry has cut down on his circus shots, in part to ingratiate Durant. But the Warriors and their fans feed off those 30-foot moonbeams, low percentage for anybody but Steph. (source)
It seems to me "moonbeams" refers to Steph Curry's "circus shots" (which I guess are shots made in precarious positions). But I am not entirely sure and am having a hard time understanding this metaphor. Circus shots don't necessarily have to be straight shots. Also I am not sure what the second half of the sentence refers to: "low percentage for anybody but Steph." The percentage of scoring circus shots?