Signalis: Mynah Quick Kill (MQK) demonstrated on casual difficulty

The Mynah boss can be killed with a single flare. The basic technique is to hold straight up as soon as the fight starts and spam auxiliary weapon. This technique will take time on par with a standard shotgun kill on casual so it isn’t that great. It should be noted though, that it also works on survivor and is faster than the 3 cycle shotgun kill and much safer. The quick kill technique requires you to run slightly left before running straight up and flaring. If you do the MQK correctly she will die instantly triggering the cut scene. The downside is, going for the quick kill can result in missing and her dropping to her knees effectively killing the run.