/startattack
/castsequence reset=target Serpent Sting,null
/castsequence reset=5 Arcane Shot,Steady Shot,Arcane Shot,Arcane Shot,Steady Shot,Arcane Shot,Arcane Shot,Steady Shot,Arcane Shot,Steady Shot,Arcane Shot,Steady Shot,Focus Fire
I know Serpent Sting is a lvl 10 but its still works