Siff - Avengers Alliance

Does anyone know how the heck to beat Enchantress? When Siff goes first I use her buff, followed by throwing the sword, usually followed by thrust, and then doing leaping slash for every round afterwards. One time I got Enchantress down to about 200hp, but with all the bleeding/iso 8 corruption bane causes Siff bled out as soon as her next turn came.

Siff is level 9 with original scrapper costume, and gets soothing rest (hp restore) when she recharges stamina.