Not to teamkill is an order. Disobeying it will result in termination of the membership of the squad.
I am very sorry with what happened. I believe it is a misunderstanding and a mistake. I support the idea of squad wars, but this is not the right time since the game structure does not support it. Helldawg is a very good and nice pilot, I am sure you know this if you have flown with him before. This is an unfortunate misunderstanding, and I don't see that it is necessary to kick him out of the squad.
We are here to have fun. We are here to shoot and get shot, yet still having fun. I usually fly against Brian and Dawsonn, both are great pilots, no doubt. I shoot them down, I have fun. I got shot, I still have fun and learn new things from them. We don't take it personally. We are here to shoot and to get shot. This is the scenario I expect from the squad wars. All of us here are friends, you may be in 111, or engima or wudf, but we share the same interest, that's why we are here.
People make mistakes. All of us make mistakes and learn from the mistakes. So, I hope everything is ok now.