Karen, Hi. I've been following your sitch for awhile now from the other board to here. I haven't posted because you've gotten such good comments from everyone else. But, I think that there's something that you need to make clear to your H.
He's forcefully taken over your time on Tuesday with the kids and is now referring to it as his time. From everything I've read, you never agreed to this. I think you need to send a response to the latest "obstruction" message. Be crystal clear that Tuesday is your time according to the schedule you both agreed to. You never agreed to switch Tues to his night. He is forcefully taking the kids against your agreement ie...picking them up from scheduled activities early in order to prevent you from having them, physically taking them from your moving car, yelling at you in public to intimidate you, etc. You are considering the saftey of your children and not intervening. However, that does not imply that you have agreed to this change. Be sure to copy your lawyer on it.
He is trying to document via the emails that you are the problem. I think it's important to document the real sitch. Then, go back to not responding. The side effect of the message just might be a kick in the pants to your lawyer. If she sees everything spelled out like that, maybe she'll do something about this. He should not be allowed to continue this abusive behavior.