Guppy I imagine that if you lose concentration for a moment that's a very quick speed builder! Imagine someone who didn't know that lumping on full power and pushing in the yoke to keep the nose down. That'd be a shock and a half.
I'm not sure I understand what you're saying.
Not all aircraft pitch up with application of power, and not all aircraft pitch down with reduction in power, either.
Change in pitch with stall depends on the aircraft in question and other variable inputs ranging from configuration to center of gravity to application of power to the type of aircraft to the nature of the stall.
Some airplanes pitch up, some down, and some not at all.
Some aircraft with a T-tail configuration at high angles of attack, particularly in a stalled condition, will continue to pitch up. They may lack elevator authority to push the nose over or reduce angle of attack, in fact. Other aircraft may pitch down substantially, and some T-tailed aircraft may exhibit very different characteristics.
Blanket statements tend to be very inaccurate, particularly when attempting to define what one aircraft does based on what another exhibits.
An excellent example given previously for unconventional behavior with power application is the Lake Amphibian. Apply power and one has to increase back pressure on the controls because the aircraft wants to pitch nose-down. Nose-down trim is required. Conversely, reduce power and the aircraft wants to pitch nose-up.
What one can expect from an aircraft should be placed specifically in context for the aircraft in question, under a given set of circumstances.