Fiz worries for Tyrone's safety but puts herself in terrible danger.
She clashes with a twisted Kirsty who causes a bloody accident at Underworld and then threatens her.
Jennie McAlpine, who plays Fiz, said: "She's frightened at first but quickly gets angry. She's not scared of anyone."
Watch the exclusive interview with preview clips of Kirsty and Fiz's shocking battle.
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