Yeah, I need to add a similar flag.
It's true a panic attack is not the worst thing that can happen. Maybe it should only pick up it's weapon, but leave other stuff, like ammo still on the ground?
Another solution, if it's the last alien on the map, it might panic, prime a grenade and drop it and blow itself up :p Now that would be hilarious. And useful to end those boring last alien searches. You could explain it as some sort of self-destruct, to avoid being captured and being experimented on :p
(be sure to capture the commander fast, or he will self-destruct himself)