since robin was absent who was head judge for the night

Clue - Karen was sat in his seat

As it turned out, it was a moot point as she didn't have any deciding votes to make

Head Coach and Head Judge, how can that possibly work?

It's not what you know, it's who you're doing.

Ashleys not a skater, Jasons not a skater and God forbid that he became head judge. Nicky was a guest judge so Karen was the obvious stand in.