New Mord ult is buggy

i was playing {{champion:35}} vs. {{champion:82}} . {{champion:82}} ults me, starting the 1v1. when i cast my ultimate, my clone appears but wont attack. when {{champion:82}} ult ends, the clone vanishes, but doesnt die. the cooldown doesnt start until the full duration of my ult elapses, and no boxes appeared. i understand its supposed to be a 1v1 but im still only one player, why does the clone not work? why should his ult make mine useless??
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