Strongbox bug?

I opened a strongbox guarded by 6 pack of mobs, identified it exalted it the location was close to a corner. after spawning mobs I couldn't cast only move, I got backed into a corner and that's my life over. 6 seconds in which I couldn't cast from the moment I opened the strongbox (full mana/full hp/full energyshield,no debuffs except getting shocked at times).
hopefully this will help you as I'm tired of QA'ing bugs and uninstalled