Hammerheads are fun and relatively straightforward (timing) , but occasionally have the ability to scare the be-jazus out of you. The mechanics (physics) are fascinating.
and the buffet depending on the a/c is often a very clear and obvious cue to step on the rudder and use as much neutral pitch opposite stick (left hammer, right stick - counter the downgoing wing loss of lift (outside wing faster = more lift), right rudder, power off as she passes the horizon, approaches the near vertical downline)
if you get it wrong (and I have) you'll end up on your back due to both the torque (pronounced effect at low speeds) and the difference in lift on the down going wing and "top" wing (i.e the one on the outside) will put you embarassingly on your back
DOOH!
its fun tho!
there is also a possibility of her sending you a very clear message by literally spitting you into a spin, usually in the direction of your hammerhead if you don't cut the power - now that wakes you up!!
The pitts is a case in point, very skittish so you need to be spot on with the rudder and stick - often going from a left hand spin into a right hand sans petit temps if you go to hard on the opposite rudder