Not sure if that sounds right, as the likelihood of overspeed shouldn't be any greater than when winding up for a power terminated auto, should it?
It's been a while, but I remember it being about stopping the bleed band from opening and closing, wish I could remember why now though!
A vague idea about the bleed band being air pressure actuated but controlled by different fuel pressures in the FCU keeps rearing its head in my mind, so maybe the position of the N2 governor lever has some effect on it.
Anyhow, enough waffle, and happy Hueying to all.