Raphael's "Berserker Rage"

[heretic888]

This is from the TMNT Palladium RPG:

Raphael has some kind of minor insanity that makes him the "crazy" man of the group. He has problems being controlled and cannot even control himself. When agitated, he has a 75% chance of going into a "berserker" rage. It takes several melee rounds for him to recover himself. He's fine most of the time, but when he gets into a berserker rage, watch out! This makes him an awesome fighter, but also a little hard to live with.

This "berserker rage" is never clarified in the RPG itself. Anyone have any ideas on how to implement it in game terms?? I was thinking of a temporary bonus to Physical Strength, Physical Endurance, Speed, and possibly SDC/Hit Points... with a temporary penlalty to Intelligence, Mental Endurance, Mental Affinity, and Physical Prowess.

What do you guys think??