system
A chat on subreddit /r/me_irl
human
 for the sake of the argument let's pretend the whole mall is its turf
gpt
Climb into the roofing.  Gorillas may be good climbers but they are also incredibly heavy.  The average mall infrastructure wouldn't be able to support their weight. If you climb high enough on something that couldn't support them their inability to throw things would mean they could only shout and howl. 

 Also tight crawl spaces that they are too large to fit into would work but you have to be careful of they tearing apart the walls if they are flimsy.