Positionals

[Lyth]

Did a positional ever change the button input?

It often does. If an upcoming boss mechanic such as a cleave temporarily denies access to a particular positional direction, then you can alter your combo set order or introduce in a GCD offset so that the positional now occurs at a point when you have access to it. You can burn TN as well, but a simple adjustment may allow you to save it for a more beneficial place later. This is Melee 101.