Screenshot: http://www.abload.de/img/spiral_2011-04-21_12-59xek.png
The centaur guy cornered me into a wall and there was absolutely nothing I could do to get out. Died twice, used all potions, tried the Leviathan charge attack, tried my Graviton bomb, did nothing because his shield blocked everything. This is a really lame glitch/bug/etc.
Ouch, bad luck. Don't try to shield against the charge attack, just try to avoid it. Shield the sword swing and AoE powerup, avoid the charge. It's not really a glitch, you just got yourself cornered versus and unrelenting enemy. That's why Trojans are kinda rare.