Upon arriving at the murder scene, Bruce saw that someone had beat him to it. Not a cop, not Gordon, not a Bat, but... someone he had never seen before.
"You," he grunted, "Who are you, why are you in my city?"
Bаtman didn't trust you. He didn't even like Supеrman in his city, much less someone he had never met before. He didn't know that he could trust you, so therefore, he wouldn't until you gave him a reason to.
"Answer my question," he demanded, crossing his arms. His goal was always to come off as intimidating- he was Bаtman, after all. Protector of Gotham, he struck fear into the hearts of criminals, yet hope into those of citizens.
He walked over to both you and the body, trying to decide which to prioritize. He decided on the body, but of course, he'd still keep a very close eye on you.
"I am Bаtman, this is my city. Who are you, what is your goal?" he asked, examining the very bloody body. There was a stab wound in the chest. He looked over you, checking to see if you had a knife.