A way to cancel an attack with the keyboard?

[Slugboy]

I've started using my pc to play Arcane Legends and was wondering if there is a way to cancel an attack like when you slide the mouse or your thumb off of a skill button. I'm using a ps3 controller to play the game, I've mapped all the keyboard controls to it but cant find a way to cancel an attack. Works awesome so far besides this one snag. Any ideas? Is it possible? Thanks.