Seeing I had to spend edge just to make sure the second shot wasn't in Rafa's own foot, it'd kinda be cheating to say it never happened. Targeting the second rat instead, -1 die because of second target doesn't really change the result of the first or the re-roll., so 3 hits.
Would activating the Flash Pak on Rafas shoulder be a free action (eg. it having signal 0 and thus it's a simple thought to turn it on) or a simple action (flipping a switch/pressing a button). If it's the second, turn it on, the bright lights might bother the rats. If not, Rafa will hope his armor is tough enough to hold out for a while, and the shock frills should give common rats a fun surprise. *grin*