I'll explain again.
First, Slager will be well coached in how he should respond IF he takes the stand.
The defense will argue that he had no idea why the suspect fled from a minor traffic violation. They will argue that no one would logically run from a $50 fine when the police have your name, address and vehicle. They will argue that Slager felt he was pursuing a desperate criminal. They will argue that, in Slager's mind, his suspicion was confirmed when the suspect attempt to take his taser. They will argue that Slager feared for his safety, and the safety of the community, and he felt he had to stop the suspect at that very moment, that going to his house later would not be in the best interests of the people of that community. They will argue that he had to make all these decisions in a matter of seconds. And they will argue that his actions, while on duty protecting and serving the citizens of North Charleston, were more than reasonable.
And the prosecution will say "Did you see the video?" as that will be the only shred of hope they have.