Running while channeling katarina's ult

I've played many katarina games, and only had encountered this bug a few times, however it is possible to run while channeling her ultimate.

I was really eager to try to recreate it but I couldn't. Then I noticed you could run while channeling B one day. It seems that the easiest way to do it is issue the move command and B at the same exact time(lol? many retries)

Anyways, once you do start running as katarina while ulting, do not change your direction. You only get one command, the rest will interrupt it again.