I'm not entirely sure about this whole "Yang resists poison with her aura." There is only one poison/venom-related feat in the entirety of the R.W.B.Y canon. And this one feat is Tyrian Callows successfully stinging Qrow and putting venom in his body. It was never shown or stated that he ran out of aura, and if he had, he would have most certainly passed out. It is only reasonable to assume that aura was still protecting him, since it is passive, and yet, he had venom coursing through his body and he was bleeding out.
Case in point, Yang's profile does not state anywhere that she has resistance to poison. If she were to have it, we would need to make a CRT to add this to her profile before continuing this thread, as per the forum rules. It does state she has resistance to extreme weather conditions, including lava, but this does not translate to poison resistance by any means.
Anyhow, I think this match is fairly inconclusive. Horobi has the arrows to attack, but Yang can easily tank hits from arrows, not to mention that with speed equalized, she can very easily dodge them. They are basically an irrelevant factor in this battle, unless Horobi can find a way of slowing her down. On the other hand, just based on what is listed on the profiles, it seems as though Horobi has the skill-intelligence advantage. This is by no means decisive, but an advantage nonetheless. It ultimately is going to boil down to stamina, above all else, but since there seems to be no good way of gauging and comparing their stamina here, it's hard to tell who would run out first. Hence, why I am voting inconclusive. Yes, I did argue that Yang can get venomed. This is assuming she gets hit, though. Simply assuming she will get hit without further arguments or further context isn't going to fly. Similarly, on the other hand, it seems to me as though Horbi has high tanking capabilities, so I don't think Yang can win this easy even if she constantly stays out of range. Again, it ultimately comes down to stamina.
Inconclusive FRA.