Lots of possibilities. ... it's not like he was 300 lbs...
1. I could carry/drag/manhandle him up the stairs. Again, I don't care if i hurt him.
2. Since I only tied his arms, I force him onto his feet and make him walk, and if he resists I cut/stab and make him comply.
3. I show him a cell phone pic of his son tied up, and tell him I'll kill them all unless he does what I say, and he complies and walks upstairs.
4. Many homes in that price range have elevators. Drag him to the elevator.
Or initial scenario goes down differently. .. I have women and boy tied up upstairs, and I wait with them upstairs. When he walks upstairs and into the bedroom, I rush him from behind then.
Again, the vast majority of people are not prepared for a violent encounter, particularly not in their own home where they feel safest.
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