Problems getting Lenny with you in the Hitman Absolution level Shaved Lenny?
Then here is the solution / walkthrough.
You can't kill him because he got vital information about Victoria.
Instead, kill the two other bad guys.
1.) Use the wrench to connect the wire.
2.) Turn on the power switch. This will kill the first bad guy.
3.) Kill the other bad guy silent with your wire.
4.) Drag him to the cabinet upstairs and hide him there.
5.) Now it is time to subdue Lenny. Do this in the barbershop.
If you have tried this in the wrong order, as I did the first time, nothing happens. But if you subdue Lenny in the barbershop you will succeed with this hitman mission.
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