I was guarding se lever alone dragon. Dragon came and I flip lever. After that start casting ice storm followed by acid rain. Then I hit energy vortex button...then poof I died..i see gargoyle came but they don't hit me... don't really know what the hell happen .. here is the combat log

(Combat): You begin to cast Ice Storm at level 22.
(Combat): You begin to cast Acid Rain at level 26
(Combat): You begin to cast Energy Vortex at level 40.
(Combat): You are affected by your energy vortex (acid).
(Combat): An aura of damaging acid surrounds you!
After that all combat logs about effect removed from you when u died..
(Combat): You suffer 646 points of damage from Poison Exploit
(Combat): You begin to cast Energy Vortex at level 37 x2
(Combat): You were killed by Talloss

Anybody know what happen/ facing similar situation?