Also, they’re sensitive to moving shadows. As with motion sensors, if you move slowly enough, they cannot sense you. Slowly circle behind them and they jump into your death mitts.
Anyway, this has worked out better for me than a Bic lighter and hair spray. But that works too.
There are these particularly annoying flies that I encountered in Florida. When they land you can blow on them which will cause them to hunker down and brace against the wind leaving them vulnerable to a swat
Interesting technique
Hey it’s me ur fly