Pantheon glitch with Ult and Zhonya

While screwing around in the sandbox mode with pantheon, I tried to ult and zhonya at the same time and after attempting it for like an hour I did it and during the zhonya it makes his ult make contact like 6 times before the zhonya is up, but the timing for it is like a tenth of a second How to replicate: Play Pantheon, Buy Zhonya's Hourglass, Reach level 6, Attempt to use Ultimate and Zhonya's Hourglass at the same time. Keep in mind the the timing is so precise it is almost impossible to do The timing for it is so slim, but knowing how some people try to make scripts for the game, if someone else figures out the timing im sure they would try to make a script for it