Since you have no cell service, you need to make a deal with one of your other coworkers for mutual support. Everyone has to be on Chatty Cathy alert. If he shows up at your cube, your lifeguard calls your extension. You provide the same service for someone else in your end of the cube farm. Not foolproof, because Chatty Cathy may end up trained by intermittent reinforcement to only approach someone when their lifeguard is in the bathroom, but you could get a month or two's use out of this strategy.
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