How do you handle confrontation?

How do you handle confrontation? When it comes to having to defend something you did/said in front of a group, how do you usually do? Is your narrative building as strong as the one the other person is presenting? Even when you’re right and they’re wrong, does your stutter prevent you from making the best possible case for why you’re right and they’re wrong? One of my irrational fears is being at the wrong place at the wrong time, having cops arrive, question me, and arresting me for giving them an unconvincing alibi.