Activate Crosshair animation on right mouse hold, and backwards on release

Hi im really new to Unreal Blueprints and UMG. Im trying to create different crosshairs for different weapons.
Also i have done some animations, simmilar to the talented Jeff Christy here:

I want to have the crosshair/reticle run a flipbook animation forward to morph the crosshair into a different state. and then back again. which should be activate on right mouse hold.