On top of those examples... Incapacitation is the biggest reason an F/O can initiate an abort!!
As an S/O I would probably also answer the cabin interphone on takeoff... if something is considered serious enough to get called up in what is continuously stressed as a 'no-contact' period, then I want to know what it is! The others no doubt would too, and I'd tell them with something simple, like FIRE, or HIJACK. Or if there is no 1-word explanation and we're 3 knots below V1: STOP!
But that's all close to the realm of immediately life-threatening, where SOPs take second seat to saving everyone's life (including your own).