It’s not some crazy weird “wombo combo” it’s just the basic nuke setup that either sm /ruin or nf/conflag would use to actually threaten a kill (though nf/conflag would substitute immolate/conflag for the 1.5 and instant when conflag was off cd, then go back to a bolt/pain/burn combo if conflag was on cd)
It’s literally how you generate burst and/or open up a kill window.
The hard to get off combo that gets impractical in group pvp would be trying to double hardcast bolt consecutively.