[dsr_]

Although it doesn't work for mosquitos, it does work for "bandits":

John will both try and kill bandits.

... meaning that John will serve as judge and executioner, if not jury.

[madcaptenor]

I'm hearing "try and kill mosquitoes" with "try" meaning "eat", except it doesn't quite work because obviously John should kill the mosquitoes before he eats them.

[gwd]

Here's where HN needs a "cry-laughing" emoji. :-)