This moment is of great significance for both characters and it coincides with the event which happens in the house.

coincides 是动词 coincide 的第三人称单数形式。coincide 由前缀 co-（表示"共同"）和词根 -incide（来自拉丁语 incidere，意为"落下、发生"）组成，字面意思是"同时发生"或"巧合"。在句中表示"（两件事）同时发生"或"时间上重合"。