If you use the Kira laser on the last few seconds before a new round starts on execution mode the laser will stay for a few seconds the next round.
It’s a pretty useless bug because the enemy respawns and you don’t get any points (perhaps if you timed the laser better you could actually kill them without the enemy respawning?).
I made a video showcasing the bug https://youtube.com/watch?v=CEso7pkuKUY