その火事は

that fire

→ 其の
phrase Rare #33,373
that fire その means “that” and 火事 means “fire”; は marks the phrase as the topic. The phrase refers to a specific fire already mentioned or understood from context.
JA: その火事は大きな被害をもたらした。
EN: That fire caused extensive damage.

その火事は記録残っている

That fire is on record.

その火事はスタッフが家に帰ってからおこった

The fire broke out after the staff had gone home.

その火事はおととい発生した

That fire broke out the day before yesterday.

その火事は子供のマッチ火遊びが原因で起こった

The fire was caused by children playing with matches.