Short fight. z.z
Both made suitable moves for each situation. However I noticed that Vayne's moves were rather vague on some moments. For example his first counter, which was against the Earth Bamboo technique. Vayne reacts by releasing bone from his body to defend, however how exactly this is done was unknown. The common way to use that Kaguya technique is via spikes, so he either created bone spikes to clash against the earth spikes/large needles, breaking them with a higher density. Or, growing the bones in a similiar fashion to a 'venus flytrap' where the spikes close in on each other and shut. This would create a rainbow-like structure with the bones, which would in turn provide a well rounded defense. As for Vayne's 2nd move. The forest of bones is composed of bones which are 2 times, if not 3 times taller/larger than an adult human. They are also well stuck together rather tight, creating a semi-wall like structure which would not allow your water to pass smoothly. Instead the water would break it's way through, however doing so would have depleted most of the water, the remaining would simply flood into the bottom of the bone forest. Shortly putting it, the S rank bone forest would render the water technique useless. While Venom's moves were direct and rather easy to counter, his moves were slightly better and he did hold the flow of the battle. Sorry Vayne, Venom advances to the next round.