Basically, it's a battle between two of more of the rpers. Like this.
Char A writes: Bob attacks with his sword towards David. He PREPARED to strike him at the leg.
Char B writes: David jumps up and fells on his back. He eyes Bob's arms.
Char A writes: Bob attacks David in the leg.
Char B writes: David screams in agony, spins over and attempts to stab Bob's arms. He misses, due to his pain.
etc, except with more description. Notice the chars only write about their own chars.
BTW: If your character is fatally wounded, then you die.