The concept is to have a building that generates shield similar to the one around the sentries when you are using Wrangler. There should be a special effect applied to the generator ring similar to the rotating light ring above the center control point in map Nucleus. The bear trap originally was going to replace the PDA, so you could use them at map Degroot Keep, but it was later combined with the shield generator to make a building set.

The shield generator replaces the sentry and the bear trap replaces the teleporter.
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http://steamcommunity.com/sharedfiles/filedetails/?id=21324