That ending. Really speculative as to what actually happened. Did he hold them hostage, or did he make it up? There are two valid theories - first, he did go into the room and threaten them with the knife. Second, he didn’t and it was in his imagination. Either way, it was seemingly to get back at the unfaithful husband, although neither makes a huge amount of sense as the wife already knew about it.
He was a really tragic character and I couldn’t help but feel sorry for him. It was particularly tragic that in the end, he took photos of the room in a was a child would, showing that he had never really grown up beyond his abuse
The actors other than RW were a bit weak unfortunately.
There is a really jarring jump scare with the red eyes and the blood, really made us jump!
As a final remark, this film has an excellent score that really sets the unsettling mood.