That's a good point. It takes about 1 second in D2 to TP back to town so if the doorbell, phone or anything goes simply just back to town and you're sorted.
I'm assuming D3 will have a similar system of getting to and from areas so certainly isn't going to be a gamebreaker.
Can be done in combat although it takes 10 seconds to cast (not a problem if witch doctor) - so that you can't use it to cheat death also. It's similar to a WoW hearthstone in a way.
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