I don't think there is anything you can do at this point but grant the TO. It was not correct, but the official gave it so he has to live with it. If I was lead I would try and be the one to deal with Coach B. I would not give a T. I would try hard to come to B and tell him/her in a nice tone "Coach, get back in your box". Calling a T here is not going to make this any better. Now, if B coach stays there and continues to argue I think you have grounds for a T but there's no way I would do this initially. It would be a fun post game discussion too.
