knife defense scenario?

so your in close quarters with your opponent, and for whatever reason you can't retreat and your opponent has the intent to kill you. you can't retreat due to military, or your wife/daughter/son/girlfriend/sister is behind you and at risk also. so you can't flee. you were on a date or whatever excuse you would like for not having a weapon.

so the attack is like a boxing hook but with a knife coming out the thumb end of your hand. arm is extended a bit farther then a boxing hook but that's the motion. the target is somewhere on the back above the hip to just above the floating ribs or even high ribs. what is your defense or strategy against this attack.

i'm thinking of rotating into it and blocking and with my other hand striking the neck or temple and following through to lower the head into a katagatame or a kimura (figure 4 lock). i'm also thinking about uchi (entering under the arm and letting the swing continue) but at a certain hight that is no longer available. and i'm also thinking a kick to gain distance then letting the strike continue then enter and do a standing armbar style movement with my body (rokyo).

the question is what would you do in that situation and what style do you train in.