question about berserk special

[link87]

tbh im not realy all that sure but depending on what weapon it is i think theres a % that increases or decreses. eg the double guns. cant remember what there called i think its the m & a 60 vice has that effect. i think it drains 10% per hit. but in a 3 hit combow ur acctually hittin 9 times meening 90% of ur health will have gone.
best thing to do is b carefull with it. i remember my m8 used to use it on the boss while my force was using resta non stop lol. it was a gr8 combow