ok i am playing borderlands and i am playing as brick

my prob is this while in berserk mode im getting killed by enemies this cant be because its states that when you enter berserk mode you again resistance to ALL damage. here is the quote from the game

Brick's Active ability is a Berserk Mode in which the screen goes red, he holsters his weapon and proceeds to attack with his fists. During this time, Brick also gains resistance to all damage and his health will regenerate at a rapid rate as he beats down enemies. You control Brick's berserk mode by using the 'aim' button for a powerful but slower left hook and the 'shoot' button for a quicker but weaker right jab.

this cant be cause i am taking damage and dying most notably i entered berserk mode in sledge's safe house and was attack by a brawler and 3 midgets and a standard gunner guy i was pounding them with my fists but i was taking damage and i died while in berserk mode which was supposed to have resistance to ALL damage.

i know the game has its little glitches but to tell me that ok if you go into berserk mode you gain resistance to all damage for the 20 or 30 seconds that it lasts and i satnd there and game health and then some midget shotguns me and im dead all the while still in the berserk mode is more than a glitch its an out right lie..

and btw i was at level 17 when this happened and my health when full is 519 and my sheild is at 148