Hey guys,
I've put together this power siphon build in SSF, here's the POB https://pobb.in/yKqPtO6eCNlu

I am not sure what I am doing wrong, but I got no life back on kill. I have the following in my tree:

I got Blood Siphon: Gain 10 life for enemy killed

Blood Drinker: 2% of life on kill

This is a video I just made: https://www.youtube.com/watch?v=1JR1qY7CV4I

Could any1 please point me to my mistake?