hand on the triger, go to the beach !
go as close as possible and bang !
Yeah, I know, you shouldn't be there in the first place but Rick's scenario
says "you got careless" so ...
..it may well be a good idea to get as close in as (safely) possible before
the squall hits because when it passes it could swing the wind all over and
if you are swimming in from far out with a leashed kite you could find
yourself being pulled out to sea with the residual drag of the kite.
However riding "one hand on the trigger" is gambling your trigger instinct
(and functionality) against the speed and power of a squall. I think I'd be
making that final reach unhooked (or unshackled) and ready to let the
kite go to leash ( I'm sure the threat of the squall behind you would
overcome the otherwise natural instinct to 'hang on' when you feel the
suddenly increasing pull. )