"I am John Baulschoff, the brother of Deadeye and the last man you see before you die."

"Before you kill us, may I ask a few questions?" Donnie asks, his brothers behind him.

"Like what?" John asked.

Don caught him off guard and threw ninja stars at him, so did his brothers. "Did you I'm the smart one? Cause you fell for my clever trick," He says, him and the others completely stealthy now.

One of the stars hit John on the shoulder, the colonitsts opened fire on him. He jumped behind a Gatling gun.

Donnie took a wrong step and fell onto the ground, being shot in his arm about 5 or 6 times and leg and knee 8 times. Don couldn't get up, he just accepted the fact that he was about to die, until the door opened and a young teen figure threw a bladed fan through John's gun.
(Do you mind if I add a new character?)

(Not at all XD )

John jumped out of the way of the exploding gun.

(Is it bad if I guessed you would say those exact words?)
The teen was a girl, about 5'4 and had orange colored hair and blue eyes. She wore a yellow shirt over a black turtleneck. The yellow shirt was labled with a white 5 and she wore black leggings under blue jean shorts and tall black boots. She retrieved the fan and put it to John's neck.
"Who are you? And why did you shoot Donnie?" She asked.

(Naw, I try to randomly guess stuff all the time)

"It's too late, Deadeye is on his way, the cleansing shall begin."

The girl slit open John's throat and immediately went to the suffering turtle. "Donnie?" She asks, putting her hand on his bruised face from when he fell face-first. Donnie's eyes widened when he saw her.
"A-April?..." Donatello asked.

"He will cleanse the world." John said before dying.

April shot John a bird, and went back to caressing Donnie. She sat him up, and he was crying in pain. "We'll get you better, Donnie, I promise," April says, tears forming in her eyes. Raphael, Michelangelo, and Leonardo just waited for Deadeye, waiting to kill him.

"Wha--" I tried recovering him even though John was never-exactally-a-friend.

"What are you doing?" April shouts, "He nearly killed Donnie!"

"He did have his faults-but still--" I replied."Any life-including DeadEye matters here."