On setting you both to hostile and being close the autoattack kicked in and my PC immediately attacked. I only figured out that this was what happened later.

Also, on running past the downed figure of one PC autoattack once more kicked in, and my PC ended up deathplaning the other.
All was sorted out in tells but I still get the feeling that it didn't make for an enjoyable play session for anyone involved.
Again guys, sorry.
Now for the question:
Given that autoattack seems to be doing some really weird things at the moment when is a good time to set it?
In the warzone it's all a lot easier, you set hostile beforehand, but when the CvC is outside the warzone it can cause some problems, so.... When do people think hostile should be set?
Not setting hostile is not an option, although it doesn't affect melee characters too much it pretty much cripples spell casters.