Many smart people catch Bladedancers out. They can be run away from and ranged if you see them (or hear them) coming. Also a good Shotgun to the face OHKs as well. Keep your distance if possible as they don't get long in their little dance. You will die a lot but at least you have a chance. Titans on the other hand, well there is really no getting away from that smash. I think if you are high enough (jump / double jump) you should not die, maybe injured, but not OHK. This never works form me, it's instant death.