Yeah, I like Caroline Blakiston too. Pity she's slowed down with acting jobs in recent years. Damn, I'm showing my age. Damn, I didn't realise it was her in The Line of Beauty. Must check it again.
Yeah, she does look frightened, but I thought she was trying to convey the weight of the fight ahead of them, which no-one else did. Maybe if other actors had considered conveying some fear, the threat might have sold better.
As it is, she looks terrified while the others look overconfident, which just dulls the threat for me.