"Y-you…I won't let you…" Kimimaro spoke between coughs of water. Only a small part of his body was out of the water. Slowly, he pulled his spear a little more forward. Inching it forward, the tip poked Zabuza's skin, right where his heart was. "D-die…for Orochimaru-sama…I'll kill you!" Blood slowly began to trickle from the small hole Kimimaro was creating in Zabuza's flesh.
Zabuza couldn't help it. He looked at this boy and again he saw Haku. Shaking his head free of the thought Zabuza closed his eyes. "I'm sorry, I'll free you from this miserable existence of living solely for the sake of another. It's too bad you can't be saved like Haku. Maybe if you had met that team, things would've been different."
Having finished speaking, Zabuza poured even more chakra into his jutsu. Kimimaro was ripped backwards, his anchors no longer strong enough to support him. Zabuza pumped even more chakra to it, he could feel Kimimaro struggling against it pointlessly for just a few more minutes. Soon, his movement stopped and his body was slammed up against a tree.
Slowly, Zabuza began to let up on the jutsu. He watched sadly as Kimimaro's lifeless body fell from his place on the tree and hit the ground. He cautiously approached the body. When he was right next to it, he leaned down and felt for a pulse. It was gone. "I'm sorry." The ex-kiri ninja said quietly to himself before standing up and walking away.
He walked over and picked up his broken sword. "Been forever since this thing broke. It's gonna take me a couple missions to completely repair it." Having said that, he began to patch up his wound.