How did Briggs think he could handle Harry?
Briggs pulls this gun on Harry and tells him to drive. He even tells him what is in store. He will shoot Harry once they get there. Huh?
Given that Harry is physically superior and obviously does not want to die you know what will happen and Briggs knew what will happen. Harry will grab the gun away and knock Briggs out. Duh.
Love the film but this makes no sense. For Briggs to get Harry he needed to do it at Harry's apartment. At that point Harry had no idea Briggs was a danger to him. When Harry wasn't looking shoot him in the head.
The whole bomb in the mail box thing made no sense either for people who boldly shoot criminals in broad daylight. Innocent people could easily be hurt or killed.