Haunting: Scarecrow boss seems bugged (tank-bane)

[Drusyc]

The life-steal from scarecrow seems to be buggy; when his attacks actually damage me, he heals a bit - when they do almost no damage, he heals massive chunks. He basically just full heals repeatedly, because i'm a tanki boi.
I think life steal / devour has an underflow problem - at least on this boss