New York A Favelle Favco luffing crane being climbed suffered a climber slip resulting in the a shock to the structure. The tower placed on the climbing frame awating installation was shook loose from it's position and fell to the street hitting a taxi with three people inside. If any of them would have been in the passenger seat, death would have been assured. Imagine a semi landing on your car as if you were in a movie, and that's what happened.
You can, and should secure the towers to the climber. In the even of a failure of any sort the tower would be attached to the crane and likely safer than hitting the people in the street or on the job site. It varies by crane, but you have to do this... ask the dead in Miami in 2008.