Why did Guy break into Bruno's house?

Why did Guy break into Bruno's house? - From above of crop unrecognizable male drinking cup of hot coffee while resting at table with tablet in cafe

In the movie "Strangers on a Train", we see Guy entering Bruno's house at night, using the key and the map and carrying the gun, all of which Bruno had given him earlier. Then we know that he's just going to talk to Bruno's father about his son's madness and has no intention to kill him.

I simply don't get it! Why in the middle of the night? Why in the father's (supposed) bedroom and not anywhere else? Why while carrying a gun?






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Why did Guy break into Bruno's house? - Man tying shoelaces on bench
Why did Guy break into Bruno's house? - Full body male in warm clothes and round eyeglasses browsing internet on tablet and looking at camera while sitting house porch and chilling
Why did Guy break into Bruno's house? - Handsome young ethnic guy in white t shirt holding skateboard in hand and looking away thoughtfully while resting near modern building after ride





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