Pretty cool ult interaction between rek and kali

I've been keeping this to myself because it's kind of broken, but Redmercy just posted a video about it so no point now. Whenever Reksai is in the middle of his own ultimate, if you ult him with kalista, it refreshes the cd of his ult. I have no idea why but try it in game. Let your reksai fly down to bot lane to help you out, and ult him just before he arrives, and after you're down picking up the double bot lane. His ult should be up and he can he just go back to top lane, I also use this to get dragons really easily because the enemy top lane probably can't teleport across the map twice in a 10 second period. Even if they can, rek with tp can do it 3