I am not sure if this is a bug or not, but this is how it worked in my previous servers.
grasp the Shinkiro skill.
shouldn't it not fail when you cast it for the 3rd time it should make the 1st grasp you casted disappear and create a new one instead.
the current behavior is you need to wait for 1of the 2 grasp you casted to disappear to cast a new one or it will fail.
---tbh even if it's official behavior i would like for it to work like i stated in the beginning (1 grasp disappear for another to replace it on new cast)
