A/N: I had thought up a couple other ideas, but realized they'd work much better as a scene in the main story. This however, is a little more on the silly side, although I'd imagine this to be effective in actual combat.
Background: Tai fights with a large sword, Joe fights with a spear. Kari has abilities regarding light.
"Hey Joe, come here!"
Joe paused from his spear forms and looked over at Tai. "What do you need?" he asked as he began walking towards the other boy.
Tai was grinning widely, with perhaps just a bit of deviousness. "I need you spar with me so I can test out this new technique Kari and I thought up."
Joe glanced at Kari, who was standing nearby smiling. "Okay, I guess that works, since Kari's here…"
The two briefly bowed to one another as courtesy. Then Tai lifted his sword into battle position while Joe moved into a ready stance, and the two began to spar.
Joe had always had trouble blocking Tai's attacks, as his sword was heavier and so more weight went into each swing, but on the other side it meant he was a little bit slower (though not by much – he had spent a great deal of time training to make up for that weakness). However, Tai was also someone who focused strongly on offense, so Joe was spending the majority of his time watching the sword movements and dancing around trying not to get hit while looking for openings.
Then Tai grinned.
"Kari, now!"
She held a hand up, and light burst from her to become a blinding flash.
Joe made sure not to look in her direction. So this is the 'technique'? But Tai hasn't done anything –
Tai leveled his sword, and the light reflected sharply off the shiny metal.
Right at Joe's face.
"Gah! My eyes!"
Needless to say, the spar ended rather quickly after that.