Ability to reenter an already active state. Very useful when implementing anystates, because sometimes the state doesn't exit before being called again.
Lets say I have an anystate with 3 nodes. One laugh, one cry, and one yell. Now if I trigger the laugh, then cry then go back to laugh it all works perfect. But what if I wanted to make them laugh, but then wanted to make them laugh again. It wouldn't fire because the laugh node is already active. So I have to create a lot of extra transitions to make sure ALL nodes attached to an anystate are left if there is a chance of them firing again.
Hope that made sense.
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