[Taran]

Well, you can kill players in certain houses. It also depends on where they stand in others. Cast EQ a few times to get their HP down and then cast a firefield to finish them off.
Using summoning spells on doors was actually a bug on Sphere, but it was a tolerated bug as so many others since it would have been impossible to enforce it all the time.

It will be interesting to see what others have to say about this though.