The problem with bane after Bio is not the animation lock. It is the latency. Bio has not lock animation because you can cast it on movement. You need few milliseconds to let the buff "reach" the server and your client get the response. So if you use bane before the client get the response from server, you are sending to the server a Bio II-Miasma only Bane. It is a bit hard to explain, but I think is that. The only way to fix this is not allow the use of Bane while other action is being sending to server. But this can cause a real lock. It is a thing with complex fix, because you can have the best of the best connections, but you still will have a delay.