Holding the stick back that far for that length of time is the antithesis of "careful".
Dozy,
Why would you be holding a control back for that length of time. It is because the aircraft was not performing the commanded action (It couldn't).
It may be a natural human instinct to re-select or hold a control when you do not get the expected action the first time, but as we see that this can be very dangerous. Things can be happening unseen (like the trim running nose up).