Impatient

"But how do you know he had a gun? You cut his wrist before he pulled out his gun." Lu Jun-hui asked curiously.

"Oh, that! When a gun goes off, a cloud of fine particles covers the hands of the shooter leaving behind a bit of the telltale metal. Something like grey glossy powder. That man's left hand was not clean but looked dusty he seems to forgot washing them as he came running, there was also a faint smell of gunpowder around him. I guess your driver must be shot down by him."

"You can still smell the gunpowder around us." Li Na said exhaustedly.

"Yes, yes I can."

"Good, every time you doubt strangers first observe their hands and clothes to check if they are professional killers or any trained assassins."

"What if they have cleaned hands and clothes?"

Li Na chuckled lightly. "Then you must be their first target in the list." and warned him. " Be careful, if not then be ready to rest in peace!"