Ah, well, my way of thinking is like so:
Awwwwww nice drooly-wooly aliens wanna kill humans and infest my home town. Well, i guess i`ll somehow fail to warn my family and friends and simply run as fast as i can to my blonde wife`s house (predess knows what i`m talking about) and pretend i`m hurt, maybe break some ribs on the way there cos i don`t wanna lie to her, then safely tie her up in the basement and her sisters and parents outside her house so that the aliens get something if they ever reach that place and live happily ever after.
But if... they touch... my wife... then i will... personally... hunt down... and kill each and every one of them... WITH MY BARE HANDS!!!
Don`t think i`m kidding, that`s really what i would do. I really do live under the impression that i am invincible. I really am pretty crazy and stuff. I really do hope predess dies soon so i don`t have to kill her myself. I really do hope she didn`t read that. I really am spamming, sorry.
But if you still don`t like that explanation, well, i would probably do nothing except for trying to stay as close to that wife i`ve been talking about as i can and making sure she`s as far away from the danger as possible.
OK sorry for this stupid answer, it`s very late and i`m tired, i`ll post what i think someone should do, not what i would do, when i`m rested.