Yeah, this sounds like classic somatogravic illusion. When you experience forward acceleration with no outside visual references, your vestibular system produce

Yeah, this sounds like classic somatogravic illusion. When you experience forward acceleration with no outside visual references, your vestibular system produces the sensation of tumbling backwards. The natural response in an airplane, it you are not well trained, is to shove the stick forward. I've seen trainees do this in this exact situation (a go around in instrument conditions) and I've had to take over the airplane to keep us from auguring in (just like this captain did). In other words, this has absolutely nothing to do with the aircraft. This is a deficiency in the first officer's instrument flying.