Say he moves faster than the speed of thought, she's a telepath she can intercept thoughts, he has to think to move no matter how instinctual one may think something is it all starts in the brain and a telepath would know that, she teleports. She doesn't even have to teleport because unless a hit from him can disperse her molecularly it won't hurt (eternals can regenerate any injured or missing tissue and are virtually indestructible). She takes his measure the whole time probing his mind for his weakness, she transforms his costume into it, he dies painfully.