the urge to tumble her out of bed , naked , bewildered , just beginning to wake up ; to pounce on her , seize her neck like the green limb of a young aspen and to throttle her , thumbs on windpipe , fingers pressing against the top of her spine , jerking her head up and ramming it back down against the floorboards , again and again , whamming , whacking , smashing , crashing .