Anyone play Necromancer with a controller?

I’m following the necromancer leveling build by Maxroll and see that I will use Rip Blood with the node only cast on minion not on enemy to buff my golem.
The problem is when I try to use Rip Blood with my controller it randomly cast Rip Blood in the air not on my golem.
Anyone having this problem and know how to fix it?
Anyway to autocast Rip Blood on my Golem?
P/S: I’m running with 4 skeletons btw will it matter?