Just curious: Would be interesting to check out if that actually works instantly (which I doubt), when you already see the hollow rectangle. Have you or someone else tested this? I always was under the impression that blocking only would come to effect afterwards, at the next possible matchmaking.
It works on next instance load.
So if I hit block in SC, I'll still see them (though chat wont come through) and they can still try to pull me over.
However, coming out of SC is an instance change so the block will kick in. So I end up alone and so do they (this has been observed by some players already).
However, other factors kick in as well. So the block can fail under certain circumstances.
One being; you and the blocked person have a shared "friend". If they are online and in a wing with the person you're blocking - then the block will fail as the MM will put your "friend" in your instance and their wing mate whom you may be trying to block.
Which is why I cleared out my "Friends" list of people I don't know in real life.
And I now no longer accept random Friend invites.
So all I want is to add a choice to get additional reward for your additional risks.
I am ok even with victim loosing nothing in Open if destroyed by PvP causes as long as they have it disabled.
But the "risk" is completely optional.
That's like me asking for a bonus to Solo because I'm lonely when I play in it.