[@LeeRoy]

Gonad's mouth wrinkled into a small 'O' of surprise as his pee was slapped away, Shin's hands a whirring blur. It didn't take a speedometer for Gonad to see right off the bat that he was at a disadvantage in speed.

~Bwah! Fast then he be, but no more than ten stone should Shin Man weigh...~

Having roughly estimated Shin's casual speed, Gonad extended his left arm in a 'thumbs up' as his opponent hopped in, intending to plant his thumb against Shin's forehead to give him a light push backwards as his attack commenced, thus forcing him out to Gonad's arm's reach and preemptively locking him out of his effective ra-!?

Gonad, to his utter bafflement, was forced backwards partway through his thought, rocking onto his right heel.

~Bwuh!? Heavy!?!?~

Shin's mass, although still far less than Gonad's, had been substantially more than Gonad had expected of a man of such stature. If Gonad succeeded in pressing his thumb against Shin's forehead, instead of casually holding back Shin he himself was pushed back by his own counter. He'd been in a neutral stance as well, neither foot in front nor in back, thus ill preparing him to accommodate the momentum of Shin. The double fisted blow came short of hitting the barbarian, but Shin's message came through quite clearly; weight classes weren't going to decide this fight so simply.
Gonad knew as soon as he was off-balance that he'd have to recover immediately to afford no further openings. He'd be wary of his opponent attempting to grab or strike his left arm as he staggered back a step. With barely contained excitement Gonad decided to assume that his opponent had even more speed than initially showcased, just to be safe, and also reevaluated his initial assumption of Shin's weight. Ten stone? More like fifteen or sixteen at the very least. 

At the highest level of martial arts, one no longer seeks merely to 'win'. The ultimate goal of the warrior is to achieve victory at any cost in any situation, but a martial artist strives for self improvement, eternally seeking their 'perfect self'. Gonad had always fought with both ideals in mind, but as he matured he'd learned which was more important. For the weak, mercy affords enemies more chances to slay them. For the  strong, mercy means your foe can challenge you another day and help you achieve greater heights. The fear of death only serves as cheap motivation for those who don't have the will to risk their lives and learn from the same foe twice.
The berserker arts were designed purely for warfare. A supreme offensive effort that applied every last asset the body could offer to the sole purpose of slaying all enemies in an instant, with no regard for one's own safety. The last time Gonad had needed to go berserk had been against a shapeshifting demon that could take the strength of those it had eaten. He could distinctly feel a similar threat level from this little Asian half his size.
Gonad would have loved to go all out every time he fought, but the martial arts are not about appeasing one's nature. It is discipline, understanding, and growth. In war, one should pull an opponent up by the roots. In martial arts, you prune your opponent and your opponent prunes you. Gonad sought not to remove weeds, but to nurture fruit.

Could this foe, designated by the gods, rekindle Gonad's warrior's nature and make him fight without consideration for the life of his opponent?