[GAMEPLAY] Zed Death Mark Reactivation BUG

Nothing big but everytime I ult the first time it's fine but, if another zed ults at the same time and reactive his ult, I can't reactivate ult even though it says i can. its just faded or something. P.S. I'm not sure if this is true or not, it didn't happen to me but a player in the game claim it. He said he ulted at his spot but when he reactivated ult he went to a different shadow, no he did not use living shadow or anything. I mean he did but he already used it before to gain distance then death mark back. I don't have a recorder, but you can try zed in the one for all to see or test it