So, doing a refresher course on A House Built On Sand, I ran into this.
I was hanging from this ledge on the rooftop where Kong and Mendola meet, and had placed a coin strategically so Kong would walk up to the ledge (previously having gotten rid of his guard).
Used the "Attack" from a hanging position to pull him off.
As you can see, he didn't die, but rather he just got knocked out. I remember doing this before and killing him with it.
Considering that falling off of a chair is enough falling to kill NPCs in this game I think this is, if nothing else, super inconsistent with the rest of the game.
Coudn't test if this is just for "pulling" as when I tried to push him with the exact same setup (just loaded a save I had dropped 15 or so seconds before Kong arrived) the prompt to push didn't show up.
To be honest this is a bit confusing since it doesn't seem like the kind of thing that would be the result of a bug/glitch, but something intentional.