I have not seen this guy since I didn't play lately, but imo it seem that he seem to be doing it on purpose too.
I'll try to catch on.

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Could take plenty of ss and make sure. xD Especially when he get at the containers or so, will be a good time to ss.
It has to be done on purpose, you will see him remove all the conts he sees then he will turn around and build his own (occasionally).