I don't know if it counts as an error but I see it like this ... when sometimes 2 rogues leave (with a mythical 81 bow and the proc is activated, I don't know if it's mine or his)
They could change the color of the water that comes out when it is activated but only 1 different color comes out to the wearer, for example (there are 3 rogues and I see that the arc is activated but it comes out green it means it is mine and if it is blue it would be from a partner, this I would only notice it on everyone's screen but we would all see green if it was our bow)