Phew, finally caught up with all the posts.
I found the episode quite confusing to listen to. Everything seemed to move so fast and it's tricky to work out what's happening when it's on the radio.
The way I visualised it was:
Henry calls from upstairs and despite Helen's protests Rob goes up.
Whilst Rob is upstairs Helen calls Kirsty but Rob comes down more quickly than she expected and catches her using the secret phone. Helen hangs up before the call connects.
Kirsty calls back and Rob makes Helen answer. Helen says that she can't really talk, that they're still having dinner and that she's fine. (I would have thought that Kirsty would have realised that Helen couldn't talk because Rob was there and have known from her tone of voice that she wasn't fine. I wish Kirsty had called the police there and then.)
Helen tells Rob she's leaving, taking Henry with her and he'll never see her or the children again.
There is then the sound of a slap and a scream, so I think that Rob slapped Helen's face.
Rob gets the knife out of the drawer (so they must be in the kitchen) and tells Helen to, "End it now, do what Greg did." Greg committed suicide, so he's suggesting that she kills herself with the knife. It sounds like he forces her to take the knife. I envisaged him forcing her fingers around it so that he was holding it too and maybe even pushing the knife up to her throat.
Then Henry comes into the room saying, "Stop it, stop shouting." Rob shouts at him to go away. Henry refuses. Rob says, "Come here you little..."
And Helen says something like, "Get your hands off him..." So Rob must have grabbed Henry. He's just slapped Helen so Helen must have feared that Rob would hurt Henry too.
I pictured Rob being between Helen and Henry and as having turned his back on Helen to grab Henry.
After Helen says, "Get your hands off him" there is a thump (sound effect of Rob being stabbed) and Helen says sorry. It almost sounded to me like she'd forgotten she was holding the knife.
Rob is injured but not too badly as he's able to say, "Helen put the knife down. Helen!"
I think that it sounded like Rob then moved towards Helen, perhaps to take the knife, perhaps to attack her. Helen screams again and there's the sound of at least one further stabbing noise.
I think that Rob is dead. He didn't say anything or make any sound after the second stab wound. He's not moving. Henry believes he's asleep and Helen seems certain that she's killed him.
I hope that Kirsty has had the sense to call the police and an ambulance.
It doesn't look good for Helen that she stabbed him at least twice and has not called the police or ambulance herself. Especially when she threatened to kill Rob last week in front of two witnesses.
I would hope that the first stab would be deemed to be in defence of Henry and the second in self defence.