No one said let him go however if the criminal is a non-threat warrant you are prohibited from opening fire on their body. What you should be doing instead, is trying to disable their vehicle which is rather easy when they are cruising on a bike. Aim for the tires, not the body - if they are a non-threat suspect that is. Should you be the one driving without any passengers, try to perform a lagpit or promptly exit the vehicle and attempt to bust the tire.