It is called law enforcement. Remember, to GGP, Rin is a dangerous terrorist who injured few GGP members few episodes ago. The response is expected and logical considering the chain of events. Suzuri is afterall look like Rin with red orange Balon which did not look too different from Fuego. An unarmed Rideback still dangerous with its metallic arms.

Just like how our FRU disperse protesters, dangerous ones like be quickly eliminated. GGP just doing normal police procedure.