Does anyone else have trouble killing rangan with the crane?

I drop the concrete tube right on their heads and it phases throught them did anyone else have this problem?

You must count the right moment.
I was doing this up to 10 minutes back then

I also did couple retries. Time it right with the in-game timer and line it up right.
I think you can also shoot the cord that holds the thing that kills them, but I don’t know if it counts to the challenge being completed that way