Blinding powder aint that effective interrupt spell i would any day either remove blinding powder or enduring brew for a silence ability like they have in bladedancer tree.

Enduring brew is the most worthless skill i have ever seen the healing effect is utterly crap it heals for 400+ at lvl 50 and dot dmg after that for 50. Its not even a last stand life saver when classes is doing 1k dmg.. its awfully crap.