On the latest patch (May 9, 2023), there is a bug where Sigma is able to indefinitely prolong the flight of his ultimate. He cannot use any abilities during this, he can only use primary fire and fly around as if he was still using Gravitic Flux.
I was able to recreate the bug by doing the following:
- Use Gravitic Flux and allow its timer to expire, capturing at least one enemy in it when it automatically casts at the end of the timer (Casting the ultimate manually before the duration ends, e.g. using left click, will not work).
- Use Gravitic Flux and allow its timer to expire again, this time looking somewhere where the AoE is not active/visible on the ground (straight up, off a cliff, at a ceiling, etc.).
- After the ultimate’s timer expires, Sigma stays flying if he was still using Gravitic Flux, but he cannot use any abilities or even melee. He can only use primary fire and fly around. This seems to last only until Sigma dies, and it can’t even be canceled by abilities such as Ana’s Sleep Dart, Sombra’s Hack, Doomfist’s Rocket Punch, etc.