When Police are dealing with someone who has proven they have nothing to lose, it's usually time to resort to escalation. Otherwise, the situation can get out of control and someone might get hurt!
In this case, one of the suspects wanted in a wild pursuit continued to resist arrest. Law Enforcement Officers decided it was time to end the engagement and released the hound.
The suspect was tackled by the K9, who quickly "convinced" the suspect that it was time to give up.
Considering how terrifying and painful a Police K9 Officer "convincing" can be, can you blame him?