The Bashing Beam is one of many new traps built in Chorh-Gom Prison when the new security system was built in.
After Tai Lung's escape, Chorh-Gom Prison was rebuilt with a variety of deadly traps. Po and the Furious Five volunteered to test out the new prison to see if it was more efficient than the original. While the six were being given a tour of the prison by its new warden, two careless guards accidentally set off the prison's fail-safe, trapping Po, the Five, and the warden inside.
Their triumph was short lived when the Bashing Beam, the second of the traps, came rushing down from the ceiling. While the Five scattered, Po caught the beam and struggled to hold it up. Tigress joined him under the beam, and while they kept the enormous log from crushing the six, the rest of the Five used the slicer's blades to chop up the beam until it was light enough to set down.