Suspended Tristana untargetable and free firing

While playing as Nami vs the new Tristana, I bubbled as she rocket jumped away. The suspension which caught Trist at the peak of her jump somehow not only lifted Tristana out of view of the camera, but kept her there for 3-4 seconds as she auto attacked from off camera, after the stuns duration ended. I was very confused as I was taking damage from an unseen enemy, our mini map icons were right on top of each other.