Reksai: ulting to destroyed portal
As soon as Reksai ults, she moves directly to her target portal, regardless of if that portal becomes destroyed.
This is somewhat confusing if you destroy a portal and Reksai manages to activate her ult at the moment of destruction. A few seconds later, Reksai just appears next to you, and you have little reason to expect this, because there are no portals near you.
Could there be a feature of highlighting the point Reksai will erupt from, giving some kind of visual indicator, or perhaps making the single portal she's ulting to indestructible--not both halves, just the one single portal--so that it somehow makes sense that she's burrowing to "nothing."
As an aside, I think giving a global audio queue as the only sign of Reksai's ult is a bit overpowered. Other champions get minimap visualizations, and also have graphics on the main screen, for similar activities, and Reksai should not just get to skirt this: she's already really strong, without having a hidden ult.