This node allows 3 casts of sacrifice in total.
Then you grab 1 point in Sanguine Libation,
and it turns off or disables the node before it, and you can only kill one minion at a time. Then you put in all 5 points into Sanguine Libation and it sacrifices only 5, instead of 8, like the node above would entail. As you get the first sacrifice, then 2 from Catalyst of Horror, then another 5 on Sanguine Libation, but only Sanguine Libation is working it seems.