If that person has two "easts" already entered when they are attacked by the assassin they can be dead before those commands clear through and they can enter the flee command.
Yes, people are careful about stacking commands but as an assassin that can't be seen it's possible enough to be worth trying for.
It's happened to me before where I got tripped while walking and my first direction command went through just before the throw came and then the second direction command went through before the second throw and I was dead.
My whole point isn't a complaint. Just a comment that for the assassin class and skill set it doesn't always matter if you get the throw permalag.