With IS Boxer, we can set up multiple Steps.
You might be physically pressing the Q key.

And on press 1, it sends the keybind for Interact With Target.
On press 2, it sends the keybind for Down Arrow (to break the movement).
On press 3, it sends the keybind for your big nuke.

WoW does not care that you're pressing Q, Q and Q, and getting 3 actions.
All they care about is that you're pressing one key (which is your Interact Keybind).
And then you're pressing one key which is your down arrow key.
And then you're pressing say 5.

Each time one action is performed based on one key pressed.
The key never makes an intelligent decision based on whatever.
It just does what it was preconfigured to do. If you set it up for something really stupid that will get you killed, that's the way it goes.