Also note that the Glory from any enemies defeated in combat is received immediately and is not at risk.
If in a team, only the character in the Cliffhanger is KO'd, so the rest of the team resumes progression from where it stood. The only way for two characters to be in a Cliffhanger at once is for them to split a combined test (one of those that read 'this *and* that') and both fail separately.
I don't think so.
Page 23 under Working Together on an Adventure says:
"If a Test is failed, it is failed for all of the Heroes and the Danger is flipped to the Cliffhanger."
I don't see why this wouldn't apply to Cliffhanger Tests as well.